that they assist with the function of both, making an injury to either muscle group extremely disruptive to running. Both can be strained (or pulled) if they are overextended to the point that they rip slightly. A complete tear of the muscle is called a rupture
) or neglected (understretched, understrengthened), they’ll complain. And the result could be one of the two most chronic, hard-to-heal injuries a runner can face – namely, plantar fasciitis or Achilles tendinitis. To avoid the dreaded ‘itises’ it helps to first
