Workout Help

I'm 14 and I want to gain muscle so that i am not so skinny anymore. I weigh 127lbs and am 5 feet 10 inches tall. My dad said that the workout he did in the navy was 2 rounds of:

10 pushups w/ arms far apart
20 situps with nose touching knees
20 crunches with shoulders leaving the ground
10 2 part weight lifts (im at 20 lbs per arm right now)

I now have larger arms and a 6-pack, but i was wondering how to get my pectoral muscles larger.
If you have any suggestions, please tell me. Thank you.
 
You should limit your work outs to no more than 80 minutes when training for hypertrophy. Your time for power and strength work outs should be anywhere from 80-95 minutes due to longer resting times.
 
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