A surprisingly massive proportion of the inhabitants has a Leg Size Discrepancy (LLD) – I’ve seen estimates, in all probability conservative, that 70% of the inhabitants exhibit LLD. It’s usually not noticeable when the distinction is lower than 1/2 inch or so. However when it’s higher than that, the uneven loading on the pelvis beneath a squat or deadlift will be sufficient to trigger issues that ought to be addressed with corrective measures. We use a shim beneath the foot.