Not unusual: Many people cannot keep there heels flat. It may be due to a shortening of the Achilles tendon or posterior calf muscles. Try stretching before exercise
Answered 8/2/2014
4k views
Two things: Suboptimal form and/or immobility issues, particularly at the ankles can lead to this. Consider checking out: http://breakingmuscle.com/mobility-recovery/weak-foundation-how-screen-your-ankles-improve-performance-and-decrease-injury To assess for ankle immobility issues, otherwise consider reviewing your form with a certified personal trainer.
Answered 5/16/2015
2.8k views
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