I start by rolling out my calf muscles with a foam roller, 10-12 rolls on each leg. Going one leg at a time lets you put your full weight on each calf, which gives you a deeper stretch. If you don't have a foam roller, sub in a tennis or lacrosse ball, which can actually be more effective, according to Dr. Pandya. Set it on the floor and roll your muscles across it like you would with a foam roller.
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