does straining your muscles really build muscle?

ive heard some prison ways to wrk out, and one way was straining your muscles.
one is putting your hands together like you are praying and push against the hads as hard as you can over a long period of time, and that will work out your chest.

or flexing your forearrms and doing slow imaginary curls will build forearm muscle.

does this really work ?
wow! i thought it was bs.
thanks for lettin me know lol
 
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