The pull-up is also a classic upper-body strength builder and the perfect complement to the push-up, because when you push, you must also pull. Although a pull-up is more difficult, you can do one. Even if you can't right now, with some practice, you can do one.
Here's how to do a proper pull-up:
Hang from a bar or a set of rings with a shoulder-width grip.
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Make sure your palms are facing away from you for a pull-up. If they’re facing toward you, then you’re doing a chin-up.
Tighten your whole body by squeezing your butt, bracing your abs, sucking down your shoulders, and bringing your body into a hanging plank position.
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Try to create as much space between your shoulders and ears as possible. A hanging plank position, also known as the hollow position, is a straight line from the back of your head down through your tailbone. Just holding the hanging plank position can help tremendously to build the strength needed for a full pull-up.
Pull up by driving your elbows down hard toward your hips.
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Don’t use any momentum or sway when performing pull-ups. Focus on getting stronger. Try to get your throat against the bar. An even better finish is to get your chest against the bar.
Descend under control and back to a full dead hang position with your elbows fully extended.
Half-reps don’t count.