Well if your not going to the gym I would say the good old fashioned pushup. Do wide ones for chest and close ones for more arms and shoulders. Also diamond pushups are good for chest. You can also maybe buy some of those elastic bands. Look for the ones with the most resistance. Just YouTube "chest/ arm workouts no weights" and you can find lots of workouts and excercises
Well it was step by step process. Check this one it might help you.
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