How to Fix a Collapsing Arch During Single-Leg Squats

A collapsing arch during a single-leg squat usually appears as the foot rolls inward, the ankle drifts towards the big-toe side, and the knee follows towards the middle of the body. This is often called foot pronation or dynamic knee valgus. Some pronation is normal, but losing control under load can reduce balance and place extra stress on the ankle, knee and hip.

The problem is rarely caused by the foot alone. Limited ankle mobility, poor hip control, weak intrinsic foot muscles, fatigue, unsuitable footwear and rushing through the movement can all contribute. Your body may be searching for stability wherever it can find it, especially when standing on one leg.

This matters in everyday Australian activities as well as sport. Running along Melbourne paths, changing direction during netball in Brisbane, landing from a jump in an AFL training session or walking barefoot across a Sydney beach all demand coordinated control through the foot and leg.

Improvement comes from rebuilding that control gradually. The goal is not to force the arch rigidly upwards, but to keep the foot connected to the ground while the ankle, knee and hip share the work.

What the Collapsing Arch Reveals

A stable foot usually maintains three contact points: the heel, the base of the big toe and the base of the little toe. This is often called the tripod foot. When the arch collapses, the heel may roll inward and pressure may shift towards the inside edge of the foot. The big toe can also lift, grip excessively or lose contact.

Watch the entire chain rather than focusing only on the arch. The knee may move inward, the pelvis may drop on the unsupported side, or the trunk may lean to compensate. These signs suggest that balance and lower-limb coordination need attention, not necessarily that one muscle is solely responsible.

A mirror or phone recording can help. Perform a shallow single-leg squat from the front and side, moving slowly. Compare both legs, and note whether the foot loses its tripod position, the knee drifts inward or the pelvis rotates. Use a small range at first so technique is easier to assess.

Build Foot Control Before Loading

Begin barefoot or in a firm, flat training shoe if it is safe and comfortable. Lightly press the heel, big-toe mound and little-toe mound into the floor. Keep the toes long and relaxed rather than clawing them. Then gently draw the ball of the foot towards the heel to raise the arch without rolling onto the outside edge.

Practise this short-foot exercise for five to eight controlled repetitions, holding each contraction for five seconds. Follow it with slow heel raises while maintaining even pressure through the tripod. A wall or bench can provide balance support. Quality matters more than lifting high or completing a large number of repetitions.

Single-leg balance is another useful step. Stand near a stable support, keep the pelvis level and maintain the three-point foot contact for 20 to 30 seconds. Progress by reaching the free leg forwards, sideways and backwards. These small movements challenge the foot without immediately adding the complexity of a squat.

Improve Ankle And Hip Mobility

A stiff ankle can encourage the heel to lift early or the foot to roll inward as the body lowers. Try a knee-to-wall drill: place the working foot a few centimetres from a wall, keep the heel down and guide the knee towards the wall in line with the second or third toe. Move the foot back gradually while preserving heel contact.

Do not force the ankle into a painful stretch or allow the arch to flatten dramatically just to reach the wall. Perform two sets of eight to ten smooth repetitions per side. If one ankle is much more restricted, address that difference before expecting symmetrical single-leg squat depth.

The hip also needs to control the thigh as the body lowers. Side-lying leg lifts, banded lateral walks and supported hip airplanes can develop this skill. Keep the pelvis steady and avoid turning these exercises into a movement of the whole trunk. The aim is controlled resistance against the thigh rolling inward, not simply burning the outside of the hip.

Regress The Squat And Relearn Alignment

Use a supported single-leg squat before attempting a free-standing repetition. Hold a rack, doorframe or suspension trainer, and sit towards a box or bench. Start with a high target and a shallow range. Keep the knee tracking over the second or third toe, the heel grounded and the pelvis facing forwards.

A useful cue is “three points down, knee forward”. Another is to imagine spreading the floor gently between the feet, without twisting the foot or pushing the knee excessively outwards. Lower for three seconds, pause briefly and stand while keeping the foot quiet. Complete two or three sets of five to eight repetitions.

Progress by lowering the target, reducing hand support and adding a light counterweight. Stop the set when the arch repeatedly collapses or the knee loses its line. Training through poor repetitions teaches the exact strategy you are trying to change.

Footwear can influence control. Soft, worn-out runners may feel comfortable but provide little consistency during strength work. A stable training shoe can be useful in a commercial gym, while barefoot practice may help you sense pressure on the floor. Choose the option that allows good mechanics and suits the surface; hard concrete, slippery garage floors and uneven outdoor ground each create different demands.

Know When To Seek Professional Assessment

A collapsing arch is not automatically an injury, and many people can improve with gradual practice. However, sharp pain, swelling, numbness, repeated ankle sprains, significant weakness or symptoms that persist after training deserve assessment. Pain under the inside of the foot, along the Achilles tendon or around the kneecap may also indicate a problem requiring more specific management.

Australian athletes often move between several sporting environments, from beach running and gym training to weekend football or community netball. Sudden increases in workload, new boots and long sessions on hard courts can expose weaknesses that were previously manageable. Increase volume slowly and avoid changing footwear, running distance and strength exercises all at once.

A physiotherapist can assess foot structure, ankle range, hip strength and movement habits together. In Australia, physiotherapists are registered through the Australian Health Practitioner Regulation Agency under the National Registration and Accreditation Scheme. Exercise professionals can guide training, but suspected injury should be referred to an appropriately qualified clinician within their scope of practice.

Start with supported, shallow repetitions and spend a few minutes each session on foot tripod control, ankle mobility and hip stability. Record one set every week so you can see whether the arch, knee and pelvis remain more consistent. With patient progression, better footwear choices and attention to fatigue, a controlled single-leg squat can become a reliable measure of improved movement rather than a test you avoid.