Answer:
torn muscle fibers
Explanation:
due to heavy exercise your muscle fibre start having small micro muscle tears
A warm up consist of a period of non-strenuous activity that slowly prepares the body for more vigorous exercise.
Most warm up will gradually increase in intensity. The muscle which was used can be different for each activity. <span>Not only athlete, </span>singer can do warm up too.
Answer:
Pull ups, planks
For lower body run, squats
You can go to your local wildlife ranger station or you could go to a park and ask a ranger there.