Will 75 push ups give me muscular endurance?
Push ups work the chest and triceps. I think doing that many push ups will be redundant. Just try and find an exercise plan of using just your body weight, you can often find these sort of things in muscle magazines where they will have articles saying something like “Gain muscle without going to the gym. Also it might help to tell your parents that the whole weight lifting stunting your growth thing is a myth, if they will listen. You may even be able to find proof on google or something.