Push-ups are a classic exercise to build strength even when you don't have gym equipment available, but not everybody can ...

Learn to do a handstand in as little as four ... your legs are at a right angle to your body. Push back to the starting position. Repeat that up to 10 times to really work the shoulders.

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Eventually you’ll be able to do full sets of push-ups from the floor. Then, reverse the progression: start putting your feet on higher and higher surfaces. Ultimate goal: handstand push-ups.