One-leg jumping is the dominant form of explosive jumping in sport. The basketball layup, the volleyball approach spike, the high jump takeoff, the header in football, and the rebound after a missed shot are all performed from a single leg. Yet most athletes have never tested their one-leg jump performance, do not know what their numbers should be, and have no clear picture of whether their single-leg jumping ability is a strength or a weakness relative to their sport.
This guide covers one-leg jumping as a performance quality: how to test it accurately, what your numbers mean, the mechanics that determine how high and how far you jump from one leg, and how single-leg jumping ability applies across different sports. For the training exercises and programme that develop single-leg explosive power, see the single-leg plyometrics article on this site.
Why One-Leg Jumping Performance Matters
One-leg jumping ability is a distinct athletic quality that is not fully captured by two-leg jump testing. An athlete can have excellent bilateral countermovement jump performance but poor single-leg jumping ability if they lack the single-leg reactive strength, stability, and approach mechanics that one-leg jumping requires.
Research has consistently found that:
One-leg jump performance predicts sport-specific outcomes better than two-leg jump performance in many sports. In basketball, one-leg vertical jump height from an approach correlates more strongly with layup height and contested rebound ability than bilateral countermovement jump height. In volleyball, approach spike height is determined almost entirely by one-leg approach jump mechanics rather than standing two-leg jump ability.
Leg-to-leg asymmetry in one-leg jumping is associated with injury risk. Athletes with more than 10 to 15 percent difference in one-leg jump performance between their left and right legs show higher rates of ACL injury, hamstring strain, and ankle sprain. This asymmetry is invisible in bilateral jump testing.
One-leg jump performance reveals the transfer of training to sport-specific movements. An athlete whose two-leg jump improves significantly but whose one-leg jump does not has developed bilateral strength that is not transferring to the unilateral athletic actions that determine sport performance.
Types of One-Leg Jumping
Vertical one-leg jump:
Jumping as high as possible from a single-leg takeoff. Performed with either a standing start or an approach of 1 to 5 strides. Used in basketball (layup, rebound), volleyball (approach spike), track and field (high jump), and football (header).
Horizontal one-leg jump (hop for distance):
Covering maximum horizontal distance from a single-leg takeoff, landing on the same or both feet. Used as a performance test and directly relevant to long jump, sprint mechanics, and direction changes in sport.
Lateral one-leg jump:
Jumping laterally from one leg to land on the opposite leg. Used in direction changes, defensive footwork, and any lateral athletic action.
Approach one-leg jump:
Performed with a running approach of several strides. The most sport-specific form. The approach adds horizontal momentum that is converted into vertical height through the mechanics of the single-leg takeoff.
How to Test One-Leg Jump Performance
Accurate testing provides the baseline data that makes training decisions meaningful and tracks genuine improvement over time.
Single-Leg Vertical Jump Test
Equipment needed: A Vertec, wall marking, smartphone app (My Jump 2), or vertical jump mat.
Protocol:
- Record the standing reach height of each arm for reference
- Stand on the jumping leg with the measuring device within reach
- Take 1 to 2 approach steps at controlled speed
- Jump from one leg, driving the free knee and opposite arm upward aggressively
- Touch the highest point on the measuring device with the fingertips
- Perform 3 trials per leg with full recovery between each
- Record the best result per leg
- Subtract the standing reach height to get the jump height
- Compare both legs
Testing notes:
- Test both legs regardless of sport demands. The weaker leg result is the more important figure for injury risk assessment.
- Use a consistent approach length across all testing sessions for meaningful comparison over time.
- Test when fully rested, not after a training session.
Performance norms for single-leg vertical jump (from approach):
Recreational athletes: 30 to 45 centimetres
Trained athletes: 45 to 60 centimetres
High-performance athletes: 60 to 80 centimetres
Elite jumping sport athletes: 80 to 100+ centimetres
Leg symmetry standard: Less than 10 percent difference between legs for most sports. Less than 5 percent for symmetric sports where both legs are used equally. More than 15 percent difference warrants targeted single-leg training on the weaker side.
Single-Leg Hop for Distance Test
The most widely used clinical and athletic testing tool for single-leg performance. Used in return-to-sport assessment after ACL reconstruction and as a standard athletic performance test.
Protocol:
- Stand on one leg with the toe on a clearly marked start line
- Hop forward as far as possible from one leg
- Land on the same leg
- Hold the landing stable for 3 seconds without wobbling or placing the other foot down
- Measure from the start line to the heel of the landing foot
- Perform 3 trials per leg and record the best result
- Compare both legs as a symmetry index: (weaker leg ÷ stronger leg) x 100
Performance norms (hop distance normalised to height):
Recreational athletes: 0.50 to 0.65 x body height
Trained athletes: 0.65 to 0.80 x body height
High-performance athletes: 0.80 to 0.95 x body height
Elite athletes: 0.95 to 1.10 x body height
Example: A 180cm athlete at trained level should hop approximately 117 to 144 centimetres.
Symmetry index: A symmetry index above 90 percent (weaker leg is at least 90 percent of the stronger leg) is the return-to-sport criterion used after ACL reconstruction in most clinical guidelines. For healthy athletes, aiming for 95 percent or above symmetry is appropriate.
Triple Hop for Distance Test
Three consecutive hops on the same leg from a standing start. Used as a more demanding test of single-leg reactive endurance alongside pure hop power.
Protocol:
- Stand on one leg at the start line
- Perform 3 consecutive maximum-effort hops on the same leg
- Measure from the start line to the heel of the final landing
- Perform 3 trials per leg and compare
Performance norms:
Recreational athletes: 3.5 to 4.5 metres
Trained athletes: 4.5 to 6.0 metres
High-performance athletes: 6.0 to 7.5 metres
Elite athletes: 7.5 to 9.0 metres
Why the triple hop matters beyond the single hop: The triple hop reveals reactive endurance qualities that a single hop does not. An athlete who hops well on the first contact but whose second and third contacts deteriorate significantly has a reactive endurance deficit that the single hop would not identify.
Crossover Hop Test
A variation that tests lateral stability and control alongside hop power, by requiring the athlete to hop across a line rather than straight forward.
Protocol:
- Place a line of tape on the floor
- Stand on one leg beside the tape
- Hop diagonally across the tape, then back, then across again (3 hops total, crossing the line each time)
- Measure total distance covered
- Compare both legs
Why it matters: The crossover hop tests the multi-directional reactive quality of single-leg jumping that straight-line hops miss. Athletes who are strong on straight-line hops but weak on the crossover hop have direction-change-specific deficits relevant to cutting and agility demands.
The Mechanics of an Effective One-Leg Jump
Understanding jump mechanics helps athletes and coaches identify why performance is limited and what needs to be addressed, whether through technique work or physical development.
The Penultimate Step
The second-to-last step before the takeoff foot plants is the most important preparatory action in approach one-leg jumping. Its function is to lower the centre of mass and load the jumping leg for the subsequent explosion upward.
What an effective penultimate step looks like:
- Longer than the preceding steps
- Lower, with the centre of mass dropping toward the ground
- Faster than the preceding steps, maintaining the approach velocity
- The foot contacts in a position that allows the jumping leg to absorb the forward momentum
The most common penultimate step error: Not lowering enough. Athletes who remain upright through the penultimate step do not adequately load the jumping leg and lose significant potential jump height at the very last moment before takeoff.
How to identify penultimate step problems: Film the approach from the side. The hip height should visibly lower during the penultimate step compared to the preceding strides. If hip height remains consistent, the penultimate step is not functioning correctly.
The Takeoff Plant
The jumping foot plants slightly in front of the body’s centre of mass. This position allows the forward momentum of the approach to be redirected upward rather than dissipated as a braking force.
Takeoff foot angle: The foot should contact the ground at approximately 65 to 75 degrees from horizontal, with a slight heel-first or flat contact that immediately transitions to push-off through the forefoot.
Knee angle at contact: The knee bends to approximately 20 to 40 degrees during the loading phase. Less than 20 degrees means insufficient loading. More than 60 degrees means the athlete is too deep in the squat position and contact time extends beyond the optimal window for elastic energy return.
The Free Leg Drive
The upward drive of the non-jumping knee is one of the most undertrained aspects of one-leg jumping and one of the most significant contributors to jump height.
The mechanism: The angular momentum generated by the rapidly upward-swinging free leg pulls the entire body upward, contributing meaningfully to total jump height. Research has found the free leg drive contributes up to 15 to 20 percent of the total height in approach one-leg jumps.
What effective free leg drive looks like: The free knee drives upward rapidly and aggressively toward the chest, reaching hip height or above at the peak of the jump. The free leg should feel like it is pulling the body upward rather than simply swinging passively.
The most common free leg drive error: A passive, low, slow knee drive that contributes little to jump height. Athletes who correct this single element often see immediate and significant improvements in one-leg jump height without any change in physical preparation.
The Arm Swing
Both arms contribute to one-leg jump height through their upward drive at takeoff. The arm opposite the jumping leg is particularly important as it counterbalances the free leg drive.
Effective arm swing: Both arms swing downward during the loading phase and drive upward forcefully as the jump initiates. The elbows reach approximately shoulder height at the peak of the arm drive.
A useful test of arm contribution: Jump from one leg with the arms held behind the back. Compare this to a normal arm-swing jump. The difference between the two reveals how much height the arm swing is contributing. For most athletes, the difference is 5 to 10 centimetres, confirming the arm swing is a meaningful contributor worth developing.
The Push-Off Extension
The final phase of the one-leg jump involves a triple extension from hip to knee to ankle, with the plantarflexion of the ankle being the last contributor to upward velocity. This ankle push-off utilises the elastic energy stored in the Achilles tendon during the loading phase.
What limits the push-off extension: Calf and Achilles weakness reduce the contribution of the ankle plantarflexion. Hip extensor weakness reduces the hip extension component. Both are addressed through the strength and plyometric training covered in the single-leg plyometrics article on this site.
Factors That Determine One-Leg Jump Performance
Single-leg reactive strength: The most important physical determinant. The reactive strength index (RSI) measured during single-leg depth jump testing correlates significantly with approach one-leg vertical jump performance. See the reactive strength index article on this site for RSI norms and assessment.
Hip extensor strength: Glute and hamstring strength drives the hip extension that is the primary power source of the push-off phase.
Calf and Achilles elastic energy return: The stiffness of the Achilles tendon determines how efficiently elastic energy is stored and returned during the brief contact phase.
Approach mechanics: The efficiency with which horizontal approach velocity is converted to vertical height at takeoff. An athlete with excellent physical qualities but poor approach mechanics will not jump to their physical potential.
Free leg and arm coordination: The timing and force of the free knee drive and arm swing relative to the push-off. Poor coordination costs significant height even when the physical qualities are well developed.
Body composition: Relative to bodyweight, excess body mass reduces jump height. This is why jump height is often normalised to bodyweight in athletic testing.
Sport-Specific One-Leg Jump Standards and Applications
Basketball
Primary one-leg jump actions: Layup, contested rebound, and closeout situations.
Key performance standard: An NBA combine one-leg max vertical approach jump above 80 centimetres is considered elite. NCAA Division I players typically range from 60 to 80 centimetres.
The layup jump specifically: The layup involves a 2 to 3 step approach with the jumping foot planting approximately 30 to 50 centimetres in front of the basket base. The inside hand reaches upward toward the target while the outside arm drives upward for additional height. The ability to jump off both legs with similar power is important for versatility, as game situations determine which foot plants.
Practical benchmark: A basketball player whose one-leg approach jump is less than 70 percent of their two-leg standing jump has a significant single-leg power deficit that is likely limiting their in-game jumping performance.
Volleyball
Primary one-leg jump action: The approach spike is the most critical one-leg jumping action in volleyball. A 3 to 4 step approach culminates in a one-leg takeoff that produces the spike height.
Why approach mechanics matter more than raw power in volleyball: Research has found that volleyball players can improve their spike approach jump height by 8 to 12 centimetres through approach mechanics improvement alone, without any change in physical conditioning. The penultimate step and the arm swing timing are the most impactful areas.
Key performance standard: Elite women’s volleyball players typically approach spike jump 60 to 80 centimetres above their standing reach. Elite men’s players range from 80 to 100+ centimetres.
Track and Field
High jump: The high jump is the purest expression of approach one-leg jumping. The curved approach, the penultimate step mechanics, and the one-leg takeoff have been refined to the highest degree in this event. See the high jump plyometrics article on this site for the complete high jump-specific training approach.
Long jump: The long jump takeoff involves a one-leg plant from maximum approach speed. The penultimate step is even more critical than in the high jump because the approach velocity is higher and the conversion from horizontal to vertical must occur in an even shorter contact time.
Triple jump: Three consecutive one-leg contacts (hop, step, jump) make the triple jump the ultimate test of single-leg reactive endurance. The triple hop for distance test directly replicates this pattern.
Football (Soccer)
Primary one-leg jump actions: Heading, goalkeeper jumps, and physical aerial duels.
Heading approach: Most headed shots and clearances involve a 1 to 3 step approach from one leg. The heading timing is as important as jump height, as arriving at the ball at the peak of the jump requires precise approach calibration.
Symmetry matters more in football: Unlike basketball where the dominant hand determines the dominant jumping leg for layups, football players must be able to head the ball from both sides. Training one-leg jump ability symmetrically is more important in football than in many other sports.
Rugby and American Football
Primary one-leg jump actions: Lineout jumping (rugby), jump ball contests, and the one-leg push-off of an explosive direction change.
Key standard: For lineout jumpers in rugby, the ability to be elevated by lifters and then jump from a one-leg position as they are released places extreme demands on single-leg reactive power. Approach jump height above 90 centimetres is common among elite lineout jumpers.
Tracking One-Leg Jump Progress
Testing frequency: Test every 4 to 6 weeks during a training block focused on single-leg power development.
What to track:
- Single-leg vertical jump height per leg (and the ratio between legs)
- Single-leg hop for distance per leg (and symmetry index)
- Triple hop for distance per leg
Meaningful improvement thresholds:
- A 5 percent improvement in single-leg hop distance within a single training block indicates effective training
- Symmetry index improving from below 90 percent toward 95 percent or above indicates successful asymmetry correction
- Triple hop distance improving at a faster rate than single hop distance indicates improving reactive endurance alongside raw power
Frequently Asked Questions
Is it normal to jump much higher from two legs than one?
Yes for most people. The bilateral advantage means two legs together typically produce more force than either leg alone. However, the gap between two-leg and one-leg jump height narrows significantly with single-leg training and approach practice. Elite athletes in jumping sports often approach or exceed their two-leg standing jump height when measured from a running one-leg approach, because the approach momentum adds to the vertical height achievable from the single-leg takeoff.
Should I always jump off the same leg?
In training, develop both legs. In sport, the situation usually dictates which leg is used. Athletes in sports with asymmetric demands (high jump, gymnastics) naturally develop one leg as the dominant jumping leg. Athletes in symmetric sports (football, basketball for two-foot plays) benefit from developing both legs to near-symmetrical performance.
How do I know if my one-leg jump mechanics are good?
Video analysis from the side is the most reliable assessment. Check: does the hip visibly lower during the penultimate step? Does the free knee drive reach at least hip height? Do both arms drive upward forcefully? Does the push-off reach full extension at the ankle? Each of these that is missing represents a mechanical opportunity for improvement without any change in physical conditioning.
Can improving my one-leg jump help with running speed?
Yes directly. Single-leg jump power, particularly measured through the hop for distance test, is significantly correlated with sprint speed because both are expressions of single-leg explosive push-off power. Improving the physical qualities that produce one-leg jumping performance (reactive strength, hip extensor strength, Achilles elastic energy return) simultaneously improves running mechanics.
What is the most important thing to improve in one-leg jumping?
For most athletes who have not specifically trained single-leg jumping, the free leg knee drive is the single most impactful mechanical improvement available. It costs nothing physically, requires only awareness and practice, and immediately produces measurable height improvements. After mechanics, single-leg reactive strength developed through the exercises in the single-leg plyometrics article is the primary physical quality to develop.