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How fast muscles get tired vary from person to person. It will vary based on the persons activity level, how hydrated they are, as well as how much muscle mass they have compared to others. While some peoples muscles won't get tired too quickly, others who aren't very active may get tired quickly.
when you get tierd
YOUR BRAIN REACTION,YOUR muscles, tired or no tired,even weather.
The short answer is: lack of oxygen or shortage of glycogen. This site gives a bit more in depth explanation: http://news.softpedia.com/news/Why-Do-Muscles-Get-Tired-60179.shtml
The human body is composed of muscles (and all else). When you use those muscles they need oxygen. Playing "soccer" raises the muscle usage. Alas, you get tired!
Masturbation does not make you muscular, your method might. EX. squating while masturbating- will increase your leg muscles -Males stroking at a fast rate will increase your upper muscles It is like an exercise- That's why you sweat and end up tired.
There are fast twitch muscles fibers in all of your muscles, especially in your legs.
To make your muscles grow fast you need a protein rich diet and adequate exercise.
mainly the muscles in your forearm, if you alternate pick fast ( pick up and down fast) you either use your wrist muscles or elbow muscles depending on what moves, your wrist of elbow.
The muscles their legs developed so they can run fast
Pregnancy, get tired fast.
Cus he's unfit