A pull-up is a challenging bodyweight exercise where you grip a bar and pull yourself up from a hanging position. Learn how to do them properly.
You CAN Do More Pullups (JUST DO THIS!)
The Ultimate Pull Up Progression Plan for Beginners - SET FOR SET
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How to Do a Pull-up, Benefits and Versus the Chin-up - Dr. Axe
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23 Pull Up Variations to Make Pull Ups Easier or More Challenging
Chin-up exercise instructions and video
The Ultimate Pull Up Progression Plan for Beginners - SET FOR SET
Do pull ups workout the forearm muscles? - Quora