How many push ups you can do without stop if you are a fit person?
It depends on one's physical preparation and muscular endurance, it depends even on one's diet. You just have to push over your limits
But a good number of repetitions? 20-30-60-80?
101! Yeah BABY! I get stiff for a few hours, but I can touch my nose to the ground. (KEY : Fast/shake your arms a lot while you do them!)
It depends on your goal need explosive strength? Then keep low reps and improve the number of sets and the hight of the jump wit plyo push ups; need endurance? Then go for a hundred in a row; need mass? Then go with 8-12 reps and improve the number of sets