2. Push-ups

Where squats work the lower body perfectly, push-ups are an all-encompassing upper body and core stability move with a plethora of modifications. Doing just 10-15 bodyweight push-ups a day is enough to help you maintain upper body strength. And since push-ups are bodyweight, you can drop and give 10 wherever you see fit.

Never fear about having to do the traditional, knees-of-the-floor way all the time, either. Mix it up with decline push-ups, wall push-ups, inverted push-ups, and placing your hands in various positions.

If you do not have the strength to do a military push-up, drop to your knees.

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