There is a simple way to freshen up stale push-ups, and it is to make you unstable. By extending one leg out behind you, you can work your push-ups even more. This one-legged (or one knee variation) will work your arms, core and glutes. So have at it and try this tripod push-up.

To learn how to do this move read more.

• Come onto your hands and knees, so your shoulders are above your wrists, and your hips are above your knees.
• Extend your right leg straight behind you so it's parallel with the floor. Engage your abs and try to keep your heel in line with your hips.
• Now do a push-up, by bending your elbows by your sides as you lower your torso down toward the ground. Then straighten your arms pushing yourself back up into place.
• Repeat for a total of 20 to 30 push-ups, maintaining steadiness and control, keeping your abs and back strong, and continuing to extend your right leg straight out.
• For your second set, switch legs so your right knee is on the floor and your left leg is extended to the back. Do 20 to 30 push-ups on this side.

Fit's Tip: If you find you are leaning away from the leg that is up, you are cheating! Stay square through your shoulders and hips.