The calf raise on step is a calf exercise performed with the forefoot on the edge of a step or calf block and the heel hanging off the back, allowing the ankle to move through a greater range of dorsiflexion than is possible with flat-floor calf raises. The step creates a deficit position that fundamentally changes the training stimulus and makes this the most clinically important calf raise variation for both performance and rehabilitation.
Why the Step Makes a Genuine Difference
On a flat floor, the calf raise begins from a neutral ankle position (approximately 90 degrees between the shin and the foot) and rises to maximum plantarflexion. The ankle can dorsiflex only to approximately neutral on the floor before the heel contacts the ground.
On a step with the heel hanging off the edge, the ankle begins the movement in a position of dorsiflexion beyond neutral. The heel can lower below the level of the step before the concentric rise begins. This creates a deficit starting position where:
Greater gastrocnemius stretch at the bottom: As covered in the gastrocnemius and soleus stretches article on this site, the gastrocnemius is stretched when the ankle is dorsiflexed (toes toward the shin). The step allows greater dorsiflexion than the floor, producing a greater gastrocnemius stretch at the start of each rep.
Longer effective range of motion: The full range of the calf raise on step (from maximum dorsiflexion below the step to maximum plantarflexion at the top) is significantly greater than the flat-floor version. Greater range of motion training produces superior hypertrophy outcomes compared to abbreviated range training, as research on muscle length-specific adaptations consistently demonstrates.
Specific stimulus for fascicle length adaptation: Research on the Nordic curl (as covered in the nordic curl progression and nordic curl negatives articles on this site) established that eccentric loading at long muscle lengths specifically increases muscle fascicle length. The calf raise on step provides this same long-length eccentric loading for the gastrocnemius. Regular step calf raise training increases gastrocnemius fascicle length, which improves the muscle’s ability to produce force and absorb energy at longer lengths. This is the specific adaptation that makes the step version superior to flat-floor training for both performance and injury prevention.
Tendon loading for Achilles rehabilitation: The controlled lowering of the heel below the step level provides a specific eccentric and isometric loading stimulus to the Achilles tendon. As covered in the stretches for achilles tendonitis article on this site, this is the basis of the Alfredson protocol, the most evidence-based conservative management approach for mid-portion Achilles tendinopathy.
Muscles Targeted
Gastrocnemius (primary in straight-knee version):
As covered throughout this calf raise series on this site, the gastrocnemius is the primary target when the knee is straight. The step’s deficit position specifically loads the gastrocnemius through its greatest functional length.
Soleus (primary in bent-knee version):
The bent-knee step calf raise (knees bent to 15 to 30 degrees throughout the movement) specifically targets the soleus by shortening the gastrocnemius at the knee end. This is the most effective soleus-specific exercise available and the most clinically important variation for treating insertional Achilles tendinopathy and plantar fasciitis.
Achilles tendon (loaded structure):
The Achilles tendon transmits the gastrocnemius and soleus forces to the calcaneus. The eccentric loading of the heel-drop phase of the step calf raise provides the specific tendon loading stimulus needed for Achilles tendon structural remodelling.
Tibialis anterior:
The tibialis anterior eccentrically controls the rate of ankle plantarflexion during the lowering phase, working as an antagonist to the calf muscles.
Equipment and Setup
Step options:
- A dedicated calf block (the most stable and specifically designed option, with a non-slip surface and an appropriate height of 10 to 15 centimetres)
- A standard stair step (most accessible, height varies)
- A weight plate (a 25 or 45-pound plate provides approximately 3 to 5 centimetres of height)
- A step aerobics platform (adjustable height with risers)
Minimum step height:
The step must be high enough to allow the heel to lower clearly below the platform level. A minimum of 5 to 7 centimetres of height is needed for meaningful deficit. Most calf blocks and standard stairs provide 10 to 15 centimetres, which is ideal.
Stability:
The step must be stable and non-slip. This is particularly important during the single-leg version and during Achilles rehabilitation, where balance is often compromised. Use a step with a non-slip surface or wear shoes with grip. Hold a wall, railing, or door frame for stability if balance is a concern.
Step-by-Step Technique: Straight-Knee Version (Gastrocnemius)
Bilateral Version
Setup:
- Stand on the edge of the step with the forefeet on the step and the heels hanging off
- Position the feet hip-width apart with toes pointing forward
- Hold a wall, railing, or upright for light balance assistance
- The knees remain straight (near-full extension) throughout
Starting position:
- Allow the heels to lower slowly below the step level
- Lower until maximum comfortable dorsiflexion is reached
- Hold the bottom position for 1 second
- This is the starting position for each rep
Concentric phase:
- Press through the balls of both feet to rise onto the toes
- The movement is driven by plantarflexion only — the knees and hips do not move
- Rise as high as possible to achieve maximum plantarflexion
- Hold at the top for 1 to 2 seconds with a deliberate calf squeeze
Eccentric phase:
- Lower the heels slowly back below the step level
- Take 3 to 5 seconds for the lowering phase
- Control the entire descent — do not drop quickly to the bottom
- Pause for 1 second at the maximum dorsiflexion bottom position
- Begin the next rep
Sets and reps: 3 sets of 15, 2 to 3 times per week for general calf development
Single-Leg Version
The single-leg step calf raise is the most important version for both performance development and Achilles tendinopathy rehabilitation. It approximately doubles the load on the working calf compared to the bilateral version.
Setup:
- Stand on the edge of the step on one foot
- Cross the non-working foot behind the working ankle (or hold it lifted behind)
- Hold a wall or railing for balance
The movement:
Identical to the bilateral version, but performed on one leg:
- Lower the heel below the step (full dorsiflexion, 1-second hold)
- Rise onto the single tiptoe (2-second concentric)
- Hold at the top (1 to 2 seconds)
- Lower slowly (3 to 5 seconds)
- Complete all reps on one side before switching
Concentric assistance during rehabilitation:
When the calf is too weak or too painful to rise concentrically on a single leg, the opposite foot can assist the concentric phase:
- Use both feet to rise to the tiptoe position
- Transfer all weight to the working leg
- Lower slowly on the working leg only (eccentric only)
This concentric-assist, eccentric-only approach is the foundation of the Alfredson protocol described below.
Sets and reps: 3 sets of 10 to 12 per side for general training; 3 sets of 15 for Achilles rehabilitation (per Alfredson)
Step-by-Step Technique: Bent-Knee Version (Soleus)
The bent-knee step calf raise specifically targets the soleus through the same step deficit but with the knee flexed to 15 to 30 degrees throughout.
Setup:
Identical to the straight-knee version, but maintain a slight bend in the working knee throughout the entire movement.
Key difference:
With the knee bent, the gastrocnemius is shortened at the knee end and is relatively less active. The soleus (which does not cross the knee) becomes the primary working muscle.
The movement:
- Begin from the full dorsiflexion position with the knee bent
- Rise onto the toes while maintaining the bent-knee position throughout
- Hold at the top
- Lower slowly with the knee bent throughout
- Return to the dorsiflexed bottom position
Critical technical point: The knee angle must remain consistent throughout the movement. As the heel rises and the ankle plantarflexes, there is a tendency for the knee to straighten. This must be actively resisted — maintaining the bent knee is what keeps the soleus as the primary target.
Sets and reps: 3 sets of 15 per side
The Alfredson Protocol: Clinical Application for Achilles Tendinopathy
As covered in the stretches for achilles tendonitis article on this site, the Alfredson protocol is the most evidence-based conservative management approach for mid-portion Achilles tendinopathy. It is based entirely on the single-leg step calf raise.
Protocol Overview
Developed by Dr Hakan Alfredson in 1998, the protocol involves performing single-leg step calf raises twice daily, 7 days per week, for 12 weeks. The specific parameters:
Exercise 1: Straight-knee single-leg step calf raise
- Target muscle: gastrocnemius
- 3 sets of 15 repetitions
- Performed with a slow controlled eccentric (3 to 5 seconds lowering)
- Performed twice daily (morning and evening)
Exercise 2: Bent-knee single-leg step calf raise
- Target muscle: soleus
- 3 sets of 15 repetitions
- Performed with a slow controlled eccentric (3 to 5 seconds lowering)
- Performed twice daily (morning and evening)
Total daily load: 6 sets of 15 repetitions (180 total reps) for each exercise, split between morning and evening sessions.
The Eccentric-Biased Loading Principle
The Alfredson protocol specifically emphasises the eccentric phase (lowering the heel below the step). The original protocol instructs:
- Rising concentrically using both legs (or by pushing up with the hands)
- Lowering eccentrically on the single working leg only
This concentric-assist, eccentric-only approach ensures maximum eccentric loading of the Achilles tendon during the lowering phase without the barrier of insufficient single-leg concentric strength preventing the exercise from being performed.
As Alfredson’s original research specified, the exercise should be performed through pain during the rehabilitation period. The pain should not be severe or disabling, but mild to moderate pain during the exercise is expected and acceptable. Pain that worsens significantly after the session warrants a load reduction. Research on the Alfredson protocol has consistently found that the pain diminishes progressively over the 12-week protocol as the tendon adapts.
Why the Step Is Essential for the Alfredson Protocol
The step is not optional for the Alfredson protocol: the heel drop below the step level is the defining feature that provides the specific Achilles tendon loading stimulus. A flat-floor single-leg calf raise does not produce the same tendon loading because the ankle cannot move into the range of maximum dorsiflexion that creates the greatest tensile load on the Achilles.
Research comparing step-based eccentric calf loading versus flat-floor calf training for Achilles tendinopathy consistently finds superior outcomes with the step-based protocol.
The Insertional Achilles Modification
As covered in the stretches for achilles tendonitis article on this site, insertional Achilles tendinopathy (pain at the calcaneal insertion rather than in the tendon midportion) requires a specific modification:
Insertional modification: The heel is NOT allowed to drop below the step level. The calf raise is performed from a neutral ankle position (not dorsiflexed below neutral) to avoid compression of the Achilles tendon against the calcaneal insertion.
The insertional protocol:
- Begin from neutral ankle position (not below)
- Rise onto the toes
- Lower slowly back to neutral
- Do not allow the heel to drop below the step
The deficit component that defines mid-portion protocol is specifically contraindicated for insertional Achilles tendinopathy.
Progressions
Level 1: Bilateral step calf raise, bodyweight, 3 x 15
Level 2: Bilateral step calf raise with light dumbbells (5 to 10 kilograms held in hands), 3 x 12
Level 3: Single-leg step calf raise (concentric assist from second leg), 3 x 15
Level 4: Single-leg step calf raise (full concentric and eccentric on working leg), 3 x 12
Level 5: Single-leg step calf raise with slow eccentric (5 seconds), 3 x 12
Level 6: Single-leg step calf raise with additional load (dumbbell in hand or weighted vest), 3 x 10
Bent-knee progression (soleus):
Level 1: Bilateral bent-knee step calf raise, 3 x 15
Level 2: Single-leg bent-knee step calf raise (concentric assist), 3 x 15
Level 3: Single-leg bent-knee step calf raise (full single-leg), 3 x 12
Level 4: Single-leg bent-knee with slow eccentric (5 seconds), 3 x 10
Programming
For general calf development:
- Straight-knee single-leg step calf raise: 3 x 12 per side (gastrocnemius)
- Bent-knee single-leg step calf raise: 3 x 15 per side (soleus)
- 2 to 3 times per week
- Alongside the 3 way calf raise, donkey calf raise, or machine calf raise for volume variety
For Achilles tendinopathy rehabilitation (mid-portion):
- Straight-knee single-leg step calf raise: 3 x 15 per side, twice daily
- Bent-knee single-leg step calf raise: 3 x 15 per side, twice daily
- 7 days per week
- 12 week minimum protocol
- Refer to the complete Alfredson protocol guidance in the stretches for achilles tendonitis article on this site
For plantar fasciitis:
As covered in the exercises to strengthen plantar fascia article on this site, progressive calf loading is a component of plantar fasciitis management. The step calf raise (single-leg, slow eccentric) provides the most complete calf loading stimulus for this application.
- Single-leg step calf raise: 3 x 12 per side, 3 times per week
- Alongside the intrinsic foot muscle exercises from the plantar fascia article
For runners:
The step calf raise is one of the most directly relevant exercises for runners because it develops the gastrocnemius in the eccentric-lengthening condition that is most stressed during running push-off and deceleration. Include as a regular component of the running training programme:
- 3 sets of 12 single-leg (straight and bent knee) twice per week as part of the strength training programme
Frequently Asked Questions
Is the calf raise on step better than the floor version?
Yes, for most purposes. The floor calf raise begins from a neutral ankle position, which means the calf is not under significant stretch at the start of the movement. The step version begins from a dorsiflexed position, providing greater stretch at the start and a greater overall range of motion. Greater range of motion training consistently produces superior hypertrophy outcomes and greater fascicle length adaptations. For rehabilitation specifically, the step version is essential rather than merely preferable.
How deep should I lower my heel below the step?
Lower to the point of maximum comfortable dorsiflexion — the deepest position where the calf and Achilles feel a clear stretch without sharp pain. For most people this is 3 to 7 centimetres below the step level. The depth will increase as calf flexibility improves with consistent training.
Can I do the calf raise on step with knee pain?
The calf raise on step involves no knee joint loading during the straight-knee version (the knee is straight and stationary). It is generally well-tolerated for most knee conditions. The bent-knee version involves sustained mild knee flexion, which may produce patellofemoral discomfort in some presentations. For knee pain, begin with the straight-knee version and introduce the bent-knee version carefully.
How many times per day should I do calf raises on a step for Achilles tendinopathy?
The Alfredson protocol specifies twice daily (morning and evening sessions). This high frequency is important: the protocol was developed specifically as twice-daily loading, and the clinical outcomes associated with the Alfredson protocol come from this twice-daily frequency rather than once-daily training. Research on once-daily Alfredson loading shows inferior outcomes to twice-daily loading.
What if my calf cramps during the step calf raise?
Calf cramping during the step calf raise is common when first beginning the exercise, particularly during the Alfredson protocol’s high daily volumes. As covered in the wall sit with calf raise article on this site, initial cramping reflects the muscle working in an unaccustomed pattern. Begin with lower rep counts (8 to 10 rather than 15), ensure adequate hydration, stretch the calf gently after each session, and build volume progressively. The cramping typically resolves within 1 to 2 weeks of consistent training.