Strength-Training Exercise: The Push-Up
Lift your arms back up behind you as high as you can, but keep your elbows straight. Bend your elbows 90 degrees and plant your hands on the ground.
They should fall almost directly in line with your sternum. At this point, your arms should be tucked in closely to your sides, your elbows bent at about 90 degrees, and your forearms perpendicular to the ground.
If you've never done a push-up like this, it will likely feel more difficult at first, but keep your elbows in close to your body. In the long run, you'll be stronger.