Push ups are a great way to get some conditioning in where all you need is a little open floor space. However I found that my hands were taking a bit of strain from the floor having committed to 100 on any day where I do not go to the dojo or the gym. Kind of a penalty for not keeping with schedule
Anyway I picked up some foam covered push-up stands to provide a positive gripping device with stability and also give higher clearance which gets more of the pecs involved. It also allows a variety of hand positions and also can be used in the way parallel bars are used, provided you can hold your legs up off the floor out front with the stands by your sides (the gymnastic "ell" position). Even if you can't you can put the heels on the floor and push up and down with the triceps.
About 15 bucks.