Purpose of this exercise: TO STRENGTHEN THE ARM MUSCLES, SHOULDER and CHEST

The more you move the position of your hands together, the more push-ups work the arms, rather than the chest.

Many people lack the strength to do even one push up in the standard position. The modified push up, in which you support yourself on your knees, is less difficult. If you can't do 8 standard push ups, perform modified push ups until you can do 30 of those. Then go back to standard push ups.