21's Bicep Curl (Barbell)
A high-volume hypertrophy technique that divides the standard bicep curl into three distinct seven-rep segments to maximize metabolic stress. This accessory movement targets the biceps through partial and full ranges of motion to induce a significant muscle pump.
Iridium tracks the high rep count against your bicep Maximum Recoverable Volume to ensure the added metabolic stress fits your current recovery capacity. Since the repetition scheme is fixed, the AI relies on your RPE feedback to gauge intensity and determine exactly when to increase the weight.
Form Cues
- Pin your elbows firmly against your ribcage throughout the entire set.
- Perform the first 7 reps from full extension to 90 degrees.
- Perform the next 7 reps from 90 degrees to full contraction.
- Finish with 7 full-range repetitions without resting.
- Squeeze your glutes and brace your core to prevent swaying.
- Don't swing your hips to generate momentum.
- Don't let your elbows drift forward during the curl.
- Don't rush the tempo; keep the movement controlled.
- Don't lean backward to counterbalance the weight.
Common Mistakes
- Selecting a weight that is too heavy to complete all 21 reps.
- Blurring the distinction between the partial and full ranges.
- Resting between the three segments.
- Using lower back momentum to lift the bar.
Muscles Worked
This exercise intensely targets the entire biceps brachii complex, utilizing partial ranges of motion to overload the muscle at different mechanical sticking points. The high time-under-tension also places significant demand on the brachialis and the forearm flexors, contributing to overall arm thickness and grip endurance.
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Secondary
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