Push-ups hit almost everything on the anterior chain (especially the core) while giving your shoulder blades a chance to move in a healthy manner during a pressing pattern for a change, since they're not pinned against a bench.

If you have push-ups down pat, then take a look at adding this advanced modification to your program. All you need is a band.

Related:  More Push-Up Variations for Strong Guys

Related:  The Terrible Two Push-Up Challenge