A sad truth – most individuals you see at your gym can never increase muscle size. They’re deceiving themselves if they assume all they need to try to to is to exercise until they feel “the pump”. They can never build muscle fast.
All the research and specialists agree you must progressively raise heavier and heavier weights with good form for building muscle fast. If you discover you cannot increase the burden on a week by week basis or your body stops responding then modification the exercises for that muscle group for a month or two.
The other huge mistake …