I believed it is reserved for muscle strengthening
Out of all of them I would say CHRIS bc your supposed to run in comfortable shoes for your feet's sake ( so that's a no to Chantelle). You are supposed to run with your arms swinging beside you or however just not still like kevin bc that burns energy you may need to finish the run. You are supposed to lengthen your stride, taking short strides for 1 burns energy and 2 it takes longer. hope this helps.
Answer:
im pretty sure the answer is c
stability that comes from the trunk and the spine
