Each week builds upon the next, which means that today you'll do more reps than you have the previous two weeks. It's important that you do all of the reps. The progression is what makes the True Muscle Trainer so effective. Do all the work and reap all the benefits.
The plyo push-ups are a perfect example of explosive power. I want your hands in contact with the ground as little as possible. Push off the ground with all the energy you can muster so you have enough time to bring your hands together for a clap and can catch yourself on the way back down.