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We all want bigger biceps - it's natural. If you want to increase the size and strength of yours, incorporate chin ups into your routine.
Chin-Ups Vs. Pull-Ups: Major Differences and Muscles Worked
Part 1: The 3 exercises you need for bigger biceps - The Fitness Maverick
Chin-ups for BICEPS
For an easy bicep workout at home just do chin ups and neutral grip ? Will i get bigger biceps if i do this ? - 9GAG
How to Build Bigger Arms (For Skinny Guys)
Can I get bigger biceps if I train them only with weighted pullups and chinups? - Quora
What Happens When You Do Pullups Every Day?
Chin-Ups Vs Pull-Ups: How They're Different And What You Should Do
7 Benefits of Pullups, Plus Beginner and Advanced Options