You can do push-ups on gymnastic rings or other suspension trainers like TRX. This adds a level of instability and the extra turn out at the top works some great stabilizing muscles that just aren't hit in a normal pushup.

calisthenics gymnastics suspension_training

Does this sound like something you would like to do? Well, you have to login first so you can add it to your goals and we can help you become the kind of awesome person that could learn to do things like this. It's a free account, you can even login using Google or Facebook so you have one less password to remember. Just look at the menu in the upper left and click on where it says howdy stranger.

After you do the "Add to Goals" button below won't be greyed out anymore.