it depends on how many you can do
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How many push-ups can Charles Bronson do
I Think they need to do 100 push up until they get strained !
You need a full exercise regimen not just one exercise. Push ups alone will not necessarily give you visible abdominal muscles.
Average is 17-29 push ups.
The logical answer here would be to do as many as you can. Obviously the more push ups you do the better.
God is the answer
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100
50
2000
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