Press ups help biceps, lats, stomach, and triceps I personally think that press ups work more then push ups and I am a strengthening coach for a high school
the first thing they do in the morning is 50 press ups and 100 sit ups (my dads an x marine).
This really depends on the individual performing the exercise. Explosive press ups are great as a high impact workout, really impacting the muscles. Normal press ups are great as well. Alternate the two for a maximum workout.
push ups and pull ups
push ups an press ups
There is no set amount of press ups that a person is allowed to do in a day. A person can do as many press ups as their body will allow them to do. You do not want to over do it because you could strain your muscles.
sit ups, push ups, crunches, and military press
Press ups do increase chest muscle. When you're doing then it uses your pecks and the muscle above them.