If the plain pushup is too boring, make it into a burpee to add a plyometric twist and an extra lower-body challenge.
Start standing with feet hip-width apart and hands on your hips. Squat down, place both hands on floor and jump your legs straight back into a plank position. From here, do a pushup. Jump your feet back in and jump back to standing.
Form tip: Don't crane your neck up. Try to keep looking forward no matter which part of the move you're on. Click here for a how-to video.