yes he would reduce his lean body mass by cutting out weights totally.
The muscle responds and adapts to stimuli and if the stimuli isnt there as previous at that level, the muscle goes into a state of atrophy and goes through size reduction.
the body wont keep what its not using...
you WILL be using the pecs with push ups but not enough stimuli will be there to maintain exhisting muscle, i say you would lose muscle exponentially over time.
given the choice i would bench any day, i just dont have a bench at home (yet).
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