Muscle enlargement, or hypertrophy, depends on working the muscle to maximum or near-maximum contraction. It's the intensity of contraction that stimulates hypertrophy more than the number of times it is contracted. Only a few maximal or near-maximal contractions a day are necessary for muscle growth. Many an overzealous body builder finds that his muscles are getting smaller instead of larger because he's doing too many contractions or doing them too often.
Make the muscle work hard and intensely and then let it rest. By rest I don't mean just the immediate rest you give the muscle between contractions but also the rest from one workout to the next. The classic rule is to rest a muscle for 48 hours between workouts. Some bodybuilders work out every day, but they don't work the same muscle group every day. It is during the resting period that new protein is synthesized, actomyosin grows, and the muscle gets larger.
Muscle enlargement, or hypertrophy, depends on working the muscle to maximum or near-maximum contraction. It's the intensity of contraction that stimulates hypertrophy more than the number of times it is contracted. Only a few maximal or near-maximal contractions a day are necessary for muscle growth. Many an overzealous body builder finds that his muscles are getting smaller instead of larger because he's doing too many contractions or doing them too often.
Make the muscle work hard and intensely and then let it rest. By rest I don't mean just the immediate rest you give the muscle between contractions but also the rest from one workout to the next. The classic rule is to rest a muscle for 48 hours between workouts. Some bodybuilders work out every day, but they don't work the same muscle group every day. It is during the resting period that new protein is synthesized, actomyosin grows, and the muscle gets larger.
Platypus laying down some fitness science 
University degrees in motion
I do negatives sometimes and def switch up my workout...and pretty much do just about everything you say, from weight change to rep change.
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