Strengthen weak muscles and stretch shortened muscles.
Pecs is a shortened version of "pectorals" --the chest muscles above the "abs" (abdominal muscles).
maybe if you spin the spring washer and its shortened the washer move is verry fast.
The muscles will atrophy (shrink) if not used.
the image looks shortened.
They contract
you excersise
The food will not be fully break down.
antizamboniism this is the scientific answer
contrast
you will die
you exhale (: