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More repetitions of a movement that exerts your muscles in a shorter span increases size.
Repetition throughout the day will increase the amount of times you can do a specific movement with weight working against it.
100 pushups in a 5 minute span is like a 2-lane highway opening into a 4-lane highway. Might not be as busy but can handle more stress
100 pushups over the course of 24 hours is like putting strategic traffic lights to increase throughput, while traffic congestion happens you will see a dip in performance (i.e heavy weights you cant lift)
Obviously you have a definite weight limit being your body so limits can be reached with strength.
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