The drag curl is a classic arm-building move that bodybuilders have sworn by for years. In a recent Instagram post shared on Nov. 25, 2025, “The Godfather of Bodybuilding” Charles Glass revealed a common drag curl mistake and how to fix it for better biceps growth.

“Are you doing drag curls? Give this bicep movement a try and watch them grow!”

Charles Glass is an elite-level trainer with decades of experience. Boasting an engineering and gymnastics background, his grasp of anatomy and body mechanics helps him structure training for clients. From regular gym-goers to celebrities, Glass’s approach is backed up by real-life experience.

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Additionally, Glass has helped shape an era of bodybuilding legends, mainly from the 2000s, including Dexter Jackson ,

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