IMO doing push ups, sit ups, pull ups, chin ups are very important and should be done regularly. They are of benifit to overall training, and also to seeing your fitness level. A true measure of strength is how many times you can move your own body wieght through those movements. If your bench is 350, but you wiegh 375, and cant do a pull up your in sorry shape.
sorry just a little rant, but I get sick of seeing fat guys (including myself) who cant do such movements, and think its alright. I fall into this trap every so often.
I don't do this for my family, my friends, women, accolades, pride, or ego. I do it for me and no one else, its just part of who I am.