Because of the differences in grip, chin-ups mainly work muscles in the front of your body, whereas pull-ups focus on the back muscles.
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Armpit Pain During Pull-ups

Armpit pain from pull-ups may be due to muscle injuries in your teres major and latissimus dorsi muscles. Here’s how to ...
Medically reviewed by Katrina Carter, DPT Back pain, whether in the upper, middle, or lower back, affects millions of people ...
Solution: Use a full, controlled range of motion during all back exercises. If this means you need to reduce your weights, ...
You don’t need a gym to build muscle. These unique bicep and back workouts use minimal or no equipment to help you grow ...
Federal law enforcement agencies, such as the FBI, have added pull-ups to the special agent candidate fitness test. Here is a ...