There is an optimal number of sets per body part PER WEEK for guys over 40. Remember: lifting weights does not directly build muscle. Weightlifting simply creates a STIMULUS for growth inside of your muscles through micro-trauma. Your body then recovers and builds muscle outside of the gym.
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Training With Weights
by sana sim (2019-05-18)
There is an optimal number of sets per body part PER WEEK for guys over 40. Remember: lifting weights does not directly build muscle. Weightlifting simply creates a STIMULUS for growth inside of your muscles through micro-trauma. Your body then recovers and builds muscle outside of the gym.
http://www.jrhealthblog.com/how-to-start-training-with-weights/