Never, you always have working muscles. Eg: your core muscles work to keep you standing/upright.
involuntary muscles
When you work the muscles gets stronger and healthy.
Coordination of muscles is the muscles working together in sync to move a part of the body.
Muscles are warm while after working out because they contract by the myofilimants pulling together making you stronger
calf and hamstrings
heart
fingers
By working out too much.
eyelids
Red Blood cells take oxygen to the working muscles as it is required for respiration.
working your muscles too hard will lead to muscle fatige
When youre working out your biceps youre strengthening the muscles that primarily move what bone?