The reason your muscles hurt after track is because you have been running and using muscles that aren't normally used. Often if you stress before you start doing track, they will not hurt as bad afterwards.
yes you can hurt your muscles
hamstring
yes they can
Your muscles are the strongest parts of your body, even if you work you muscles to exhaustion, they will not hurt. It takes an awful lot to make your muscles hurt.
because track gives you more energetic than hockey because track can give you more muscles and stay in better shape and hockey gives you strong muscles.
where your muscles hurt
strain them, tear them, bruise them
Essentially nothing but to carry them around. There are nerves that try to keep track of what muscles are doing ... but the muscles are not actually involved with this.
we already have leg muscles at birth. what was the actual question?
yes you can by pulling them or the tendon around them,
hamstring
If your muscles hurt, it might be from over exercising them. Just let them rest a little, they may be sore. If they hurt a lot you should go to a doctor.