Always work out at your own level. If a standard pushup is too challenging for you, or you can’t get a decent number of reps that way, use one of the intermediate levels (they go up in difficulty from 1 to 3). It’s OK to stretch yourself, but there are no bonus points for hurting yourself.
Rest on hands and toes. Keep your body straight and your core muscles engaged. Do as many pushups as you can.
Intermediate Level 1
Stand about 3 feet from a wall, then do your pushups standing up against the wall.
Intermediate Level 2
Get down on your hand and knees, then do your pushups with knees on the ground.
Intermediate Level 3
Place your hands on a bench and your feet on the ground, then do your pushups. Lower the bench to increase the difficulty.