Hardest Biceps Bodyweight Workout EVER!!

In this video, Frank Medrano presents an intense bodyweight-only arm session that focuses on maximizing biceps engagement without traditional weights, using challenging calisthenics movements to build endurance and strength. Medrano shares a routine centered around a 21’s style chin-up sequence a variation of chin-ups that involves performing reps in different ranges of motion to fully activate the biceps and increase chin-up capability making it a tough yet effective way to work your upper arms even without gym equipment. Throughout the session he demonstrates and encourages consistent effort, showing how using your own bodyweight in creative ways can still deliver a demanding and productive biceps workout that pushes your muscles hard and helps boost strength over time.