Ankle inversion exercises appear on nearly every ankle rehabilitation protocol, yet the term creates confusion because inversion is also the movement that causes the most common ankle injury. Understanding the distinction between inversion as an injury mechanism and inversion exercises as a rehabilitation tool is the essential starting point for using these exercises correctly.
The Important Distinction: Inversion as Injury vs Inversion as Exercise
Inversion as an injury mechanism:
Ankle sprains are almost always caused by excessive, rapid inversion, where the foot rolls inward beyond the ankle’s passive ligamentous tolerance. As covered in the ankle eversion exercise article on this site, the lateral ankle ligaments (anterior talofibular, calcaneofibular, and posterior talofibular ligaments) are stretched or torn when the foot inverts excessively. This uncontrolled inversion is what clinicians and coaches seek to prevent.
Inversion as an exercise:
Controlled, resisted inversion exercises strengthen the tibialis anterior, tibialis posterior, and other ankle invertors in a position of safety. Far from being dangerous, controlled inversion exercises are a component of complete ankle rehabilitation because they develop the full ankle musculature rather than only the peroneals.
Why inversion exercises matter despite inversion causing sprains:
A fully rehabilitated ankle requires balanced strength across all ankle movement directions. Exclusive focus on eversion strengthening (to address the peroneal weakness associated with lateral ankle sprains) without developing the inversion muscles produces an imbalanced ankle that may predispose to medial ankle stress and altered gait mechanics. Complete rehabilitation develops all ankle muscle groups.
The clinical rationale:
The muscles that produce inversion (primarily the tibialis anterior and tibialis posterior) also contribute to ankle stability and foot arch support. Weakness in these muscles affects medial ankle support, tibial alignment during running, and the mechanics of the foot’s contact with the ground. Inversion exercises address these functions alongside the straightforward strength development goal.
What Ankle Inversion Is
Ankle inversion describes the movement where the foot rolls inward and the sole faces toward the body’s midline. It is the opposite of eversion and occurs primarily at the subtalar joint.
Visualising inversion:
Stand with both feet flat. Roll both feet inward so the outer edge of the foot lifts and the inner arch rises. This is inversion.
Normal inversion range:
Normal ankle inversion range is approximately 30 to 40 degrees. Most people have greater inversion than eversion range, which reflects the natural mobility in the inversion direction.
The Muscles That Produce Ankle Inversion
Tibialis anterior:
Originates from the lateral tibia and inserts on the medial cuneiform and first metatarsal on the inner foot. The tibialis anterior is the primary dorsiflexor of the ankle and also contributes to inversion. As the muscle that lifts the foot during the swing phase of walking and running, it is one of the most functionally important ankle muscles.
Tibialis posterior:
Originates from the posterior tibia and fibula and inserts on multiple bones of the mid and forefoot via a broad insertion. The tibialis posterior is the primary invertor of the foot (more so than the tibialis anterior) and also plantarflexes the foot. It is the primary dynamic supporter of the medial longitudinal arch and is the muscle most commonly involved in medial tibial stress syndrome (shin splints) and posterior tibial tendon dysfunction.
Flexor hallucis longus and flexor digitorum longus:
These deep posterior compartment muscles also contribute to inversion alongside their primary roles in toe flexion and plantarflexion.
Gastrocnemius and soleus (medial aspect):
The medial heads of the gastrocnemius and the soleus contribute a minor inversion component alongside their primary plantarflexion role.
Clinical Applications of Ankle Inversion Exercises
Post-Lateral Ankle Sprain Rehabilitation
Following a lateral ankle sprain, the entire ankle musculature is disrupted, not just the peroneal evertors. The tibialis anterior and tibialis posterior may be directly traumatised if the sprain was severe, and even without direct trauma, the reflexive activation patterns of all ankle muscles are disrupted by the proprioceptive damage from the lateral ligament injury. A complete rehabilitation programme restores all ankle muscle groups, including the invertors.
Medial Ankle Instability
Less common than lateral instability but clinically significant, medial ankle instability involves disruption of the deltoid ligament complex on the inner ankle. Strengthening the tibialis posterior and anterior provides active medial ankle support that assists the healing deltoid ligament.
Tibialis Posterior Dysfunction
Posterior tibial tendon dysfunction (PTTD) involves progressive weakness and dysfunction of the tibialis posterior tendon, leading to acquired flat foot in adults. Progressive inversion exercises (specifically tibialis posterior loading) are a primary conservative management strategy for mild to moderate PTTD.
Shin Splints Rehabilitation
As covered in the straight leg calf raises article on this site in the context of calf rehabilitation, medial tibial stress syndrome involves the tibialis posterior and surrounding structures. Controlled tibialis posterior loading through inversion exercises is a component of shin splints rehabilitation programmes.
Arch Support Development
The tibialis posterior is the primary dynamic supporter of the medial longitudinal arch. Weakness in this muscle contributes to medial arch collapse during loading. Inversion exercises specifically strengthen the tibialis posterior’s arch support function.
The Best Ankle Inversion Exercises
Exercise 1: Seated Ankle Inversion With Band
The most accessible and most commonly prescribed ankle inversion exercise.
How to do it:
- Sit in a chair with the foot flat on the floor or slightly elevated
- Loop a resistance band around the foot (across the dorsum or midfoot)
- Anchor the other end of the band to a fixed point on the opposite side (anchoring from the outside creates resistance against the inward movement)
- Rotate the foot inward against the band resistance (inversion)
- Hold for 2 to 3 seconds at maximum inversion
- Return slowly under control
- Complete 3 sets of 15 per side
Band anchoring position: The band must be anchored on the outer side of the working foot to create resistance against inversion. If the band is anchored on the inner side, it will assist inversion rather than resist it. This is the most common setup error.
The feel: The exercise should be felt on the inner shin, in the tibialis anterior (front inner lower leg) and deeper in the inner calf (tibialis posterior region).
Exercise 2: Side-Lying Ankle Inversion
A gravity-resisted version requiring no equipment.
How to do it:
- Lie on the side with the affected ankle on the bottom
- The top leg rests behind for stability or is stacked on the working leg
- Rotate the bottom foot inward (inversion) against gravity
- The outer edge of the foot rises toward the ceiling
- Hold for 2 to 3 seconds
- Lower slowly
- Complete 3 sets of 15 per side
Note on side position: This is the opposite side from the eversion exercise. For eversion, the affected ankle is on top (working against gravity). For inversion, the affected ankle is on the bottom (the inner edge of the foot rises against gravity).
Exercise 3: Standing Ankle Inversion With Band
The weight-bearing version that develops inversion strength in the functional position.
How to do it:
- Stand on the affected foot with a slight knee bend
- Loop a resistance band around the foot and anchor it on the outer side
- Rotate the foot inward against the band resistance
- Hold for 2 to 3 seconds
- Return under control
- Complete 3 sets of 10 per side
Exercise 4: Towel Scrunches (Tibialis Posterior Emphasis)
A specific exercise for the tibialis posterior that simultaneously develops the foot intrinsic muscles and the arch support function.
How to do it:
- Sit with the bare foot flat on a small towel on a smooth floor
- Scrunch the towel toward the body using the toes and the inner foot muscles
- Spread the toes and towel back out
- Repeat the scrunching movement
- Complete 3 sets of 20 scrunches per foot
Why this targets the tibialis posterior: The scrunching movement involves inversion alongside toe flexion, which specifically activates the tibialis posterior in its arch support function. This exercise is commonly prescribed for both flat feet and shin splints rehabilitation.
Exercise 5: Short Foot Exercise (Arch Activation)
As covered in the arch strengthening exercises article on this site, the short foot exercise activates the foot intrinsic muscles and the tibialis posterior simultaneously.
How to do it:
- Sit or stand with the foot flat on the floor
- Without curling the toes, shorten the foot by drawing the ball of the foot toward the heel
- This domes the medial arch upward
- Hold for 5 to 10 seconds
- Release and repeat
- Progress to performing in single-leg stance
- Complete 3 sets of 10 per foot
Connection to inversion: The arch-doming movement of the short foot exercise involves the tibialis posterior’s arch support function and creates a mild inversion moment as the arch rises. This exercise bridges the gap between isolated inversion exercises and functional arch support training.
Exercise 6: Single-Leg Balance on Inversion-Challenged Surface
A reactive exercise developing the tibialis posterior and tibialis anterior’s reflexive inversion control.
How to do it:
- Stand on a balance board or BOSU ball set to create a slight inversion challenge
- Maintain the single-leg balance for 30 seconds
- The inversion-challenged surface activates the invertors reflexively to maintain balance
- Complete 3 sets of 30 seconds per side
Adjusting the challenge: A fully inverted balance board (tilted so the inner edge is lower) creates a specific inversion challenge. A BOSU ball or foam pad provides a more general unstable surface. Begin with the less specific foam pad and progress to the inversion-specific tilt board.
Exercise 7: Heel Walk (Tibialis Anterior Strengthening)
Walking on the heels with the toes raised develops the tibialis anterior in its dorsiflexion and inversion role.
How to do it:
- Stand with both feet flat
- Raise the toes and forefoot off the floor so the body weight is entirely on the heels
- Walk forward on the heels for 20 metres
- Return to the starting position
- Complete 3 lengths
Why heel walking develops the invertors: The tibialis anterior must work continuously during heel walking to maintain the toes-raised dorsiflexed position. This sustained tibialis anterior activation develops the inversion component alongside the dorsiflexion function.
Note: Heel walking also specifically addresses the tibialis anterior weakness associated with medial tibial stress syndrome (shin splints), making it a dual-purpose exercise for both inversion strengthening and shin splint rehabilitation.
Combining Inversion and Eversion Exercises
As covered in the ankle eversion exercise article on this site, eversion exercises develop the peroneal muscles that protect against lateral ankle sprains. Inversion exercises develop the tibialis muscles that support the medial ankle and arch. Together, they provide complete ankle muscle balance.
The complete ankle strengthening protocol:
Eversion work:
- Seated band eversion: 3 x 15 per side
- Standing band eversion: 3 x 10 per side
Inversion work:
- Seated band inversion: 3 x 15 per side
- Towel scrunches: 3 x 20 per foot
- Heel walk: 3 x 20 metres
Functional balance:
- Single-leg balance: 3 x 30 seconds per side
- Single-leg balance on unstable surface: 3 x 30 seconds per side
Progressions
Phase 1 (Acute rehabilitation, days 1 to 14):
- Towel scrunches: 3 x 20 daily
- Side-lying ankle inversion: 3 x 15 daily
- Ankle alphabet: 1 set per foot daily
Phase 2 (Building strength, weeks 2 to 6):
- Seated band inversion: 3 x 15
- Short foot exercise: 3 x 10 in sitting, then standing
- Heel walk: 3 x 20 metres
- Single-leg balance: 3 x 30 seconds per side
Phase 3 (Functional restoration, weeks 6 to 12):
- Standing band inversion: 3 x 10 per side
- Single-leg balance on BOSU: 3 x 30 seconds per side
- Short foot in single-leg stance: 3 x 10 seconds per side
- Sport-specific drills reintroduced
Programming Guidance
For lateral ankle sprain rehabilitation:
Include inversion exercises from week 2 onwards (once the acute pain has settled enough for movement in the inversion direction to be tolerable). Early inversion exercises should be pain-free and in a supported seated position before progressing to standing versions.
For shin splints rehabilitation:
Heel walks and tibialis anterior activation exercises are the primary inversion-related exercises. Begin with 2 sets of 20 metres of heel walking daily and progress to 3 sets as tolerance allows.
For flat feet and arch support:
The short foot exercise and towel scrunches provide the most specific tibialis posterior loading for arch support development. Daily practice of both exercises (2 sets of 10 per foot) produces meaningful arch support improvement over 6 to 8 weeks.
For PTTD (posterior tibial tendon dysfunction):
Progressive tibialis posterior loading through seated band inversion, towel scrunches, and single-leg calf raises (which also load the tibialis posterior) forms the core of conservative PTTD management. Progression should be guided by a physiotherapist for this specific condition.
Frequency: Daily for the basic seated and side-lying exercises during rehabilitation. Standing and balance exercises benefit from 48 hours of recovery, so 3 times per week for these components.
Frequently Asked Questions
If inversion causes ankle sprains, why are inversion exercises prescribed?
Ankle sprains are caused by uncontrolled, excessive inversion at high speed, where the passive ligamentous restraints are overstretched. Inversion exercises involve controlled, resisted inversion at low speed in a safe, supported position. The controlled exercise strengthens the muscles that support the inner ankle and contributes to balanced ankle muscle development. There is no clinical evidence that controlled inversion exercises increase ankle sprain risk.
Should I do inversion or eversion exercises for ankle sprain rehabilitation?
Both. The standard of care for lateral ankle sprain rehabilitation includes exercises for all ankle muscle groups, not just the evertor muscles. While the evertors (peroneals) are the most directly relevant to lateral sprain prevention, complete rehabilitation develops the full ankle musculature including the invertors. The ratio of eversion to inversion work is typically higher in lateral sprain rehabilitation, but inversion exercises are included from the subacute phase onwards.
How long does it take to strengthen the ankle invertors?
Initial improvements in tibialis anterior and tibialis posterior activation are typically noticeable within 2 to 3 weeks of consistent daily exercises. Meaningful strength improvements occur within 4 to 6 weeks. Full restoration to pre-injury strength levels typically requires 8 to 12 weeks.
Can ankle inversion exercises help with over-pronation?
Yes, specifically through the tibialis posterior strengthening component. Over-pronation (excessive medial arch collapse during loading) is often associated with tibialis posterior weakness. The towel scrunch and short foot exercises specifically develop the tibialis posterior’s arch support function, which can reduce over-pronation when combined with appropriate footwear and, where indicated, orthotic support.