Push-ups [1] are one the world's best exercises because you don't need to do many in order for them to be effective. They work your upper body and core like nobody's business. If you're looking for a way to make your push-ups more challenging, try using a resistance band.

To find out how .

• Hold either end of a resistance band with both hands. Swing it over your head so it's resting on your upper back, underneath your shoulders.
• Now come onto your hands and knees. Place your hands under your shoulders and keep your knees where they are, or straighten out your legs so your body is in a plank position. The band should feel snug, neither too tight nor too loose, so make adjustments if you need to.
• Now bend your elbows out to the side and lower your chest toward the ground. Stop as soon as your shoulders are in line with your elbows. Then straighten your arms.
• Do two or three sets of 8 to 20 of these push-ups.