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.
These muscles are called "skeletal muscles".
Skeletal muscles.
The heart and the lungs, these are known as involuntary muscles.
There are many muscles in the human muscular system. The main muscles are the cardiac muscles located near the heart, the biceps muscles, the abdominal muscles and the quadrocept muscles.
Muscles that are connected to bones are called skeletal muscles, voluntary muscles or striated muscles.
Involuntarily controlled muscles
to stretch out your muscles. muscles like your leg muscles and shoulder muscles.
cardiac muscles
smooth muscles and cardiac muscles
skeletal muscles
skeletal muscles
Stomach muscles