[jyl]

Also get some gymnastic rings and nylon straps (these sell for about $20 online), hang them from ceiling, w/rings near floor, and do ring push-ups and planks.

As push-ups, this works the smaller muscles that stabilize your arms and shoulders, and you can do harder variants like flys. As planks, by pushing the rings out in front of you, you can work your core real hard.

Hang another set at waist height and do L sits (core) and reverse pull-ups (back).