Some love them, some hate them, but pushups are one of the best exercises a person can go. If you're doing them on your toes, they're really full body, working many muscle groups at the same time with an emphasis on your chest, lats, abs and back. Perform them slowly for strength and for power come up explosively, which gives you an added benefit of increasing your heart rate.
Kettlebells Needed: 1
Weight Recommended: Medium or Heavy
Pace Recommended: Slow for strength, fast for power
Directions: From a plank position, set your hands just outside of shoulder width to determine positioning, and set a kettlebell on its side under one hand with the handle pointed away from you (the added stability in this position is important). Lower your chest as close as you can to the floor with your elbows tracking at about a 45-degree angle from your webs. The webbing of your fingers should be in alignment with your shoulders. Push up to straighten the arm completely that is planted into the floor (the arm of the kettlebell-side won't straighten completely). Repeat.
Make it easier: perform on your knees
Make it harder: turn it into a "plyo" pushup by exploding off the floor and swapping which hand is on the kettlebell every rep.
Make it better: keep your hips aligned between your feet and your shoulders.