5. Body-weight Squats
Feet shoulder-width apart, sink down like you’re sitting in a chair until you make a 90-degree angle with your legs. If you want to go ass to the floor, go for it. However, if you feel pain in your knees (or anywhere else), use your head and don’t sink down so low.
6. Mountain Climbers
Get into a push-up position with hands directly beneath the chest. Lift your left foot from the floor and bring it to your chest; as you return the left foot to the start position bring the right foot up. Alternate in this fashion.
7. Burpees
These require some space. Start with feet shoulder-width apart, sink down, kick your feet back, and sink into a push-up position. Do a push-up rep. Once you reach the start position of the push-up, bring your legs to your chest, stand up, and jump as high as possible.
8. Planks – Start with 3 sets of 30 seconds and work up to 3 minutes; add variations such as side planks or mountain climbers for increased difficulty.
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