Exercise strengthens the muscles and makes the blood five more efficiently. Muscles are needed to carry out daily activities like walking ,sitting , simply moving or finger. Weak muscles cannot do these things properly and we suffer for it. Thus strong muscles make our activities much easier and more pleasant. Drops into living hell. His agony is intense.
It is important thus not to get involved with drugs in any way. Never even try any drug even if the temptation is great. Just say no and walk away. Walk away from the hell.