As to your reference to power sports, Core Strengthcore strength should dominate all other priorities. With exceptional core strength, your stamina, and long range performance improve significantly which means at the end of soccer,lacrosse, ultimate type of eventsthat you will be performing at a higher level than opponents and teammates in sports like soccer, lacrosse, and ultimate type of events.
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If you insist on "calf muscle" improvement, just attack the muscle group itself with standard toe raises on a stair, while making sure to properly stretch and warmup before hand. A torn achilles is one that is hard to recover from.