Preacher Curl (Back-on-Bench, Dumbbell)
The Dumbbell Preacher Curl is an isolation exercise that targets the biceps by stabilizing the upper arms against a bench pad to eliminate momentum. This setup emphasizes the short head of the bicep and ensures strictly isolated muscle contraction.
Iridium tracks this high-hypertrophy isolation movement against your biceps-specific Maximum Recoverable Volume to ensure you stimulate growth without exceeding your recovery capacity. Since the fixed shoulder position forces strict isolation, Iridium relies heavily on RPE trends to verify intensity and detect progressive overload even when dumbbell weight jumps are too large to increase frequently. The system also scans your 7-day workout history to schedule this exercise so that residual fatigue does not limit performance on your primary compound pulling movements.
Form Cues
- Press your armpits and triceps firmly against the pad
- Rotate your pinky fingers upward as you curl to maximize contraction
- Lower the dumbbells slowly for a 2-3 second count
- Keep your wrists straight and neutral throughout the lift
- Don't let your elbows lift off the pad at any point
- Don't use momentum or rock your body backward
- Don't fully lock out or hyperextend your elbows at the bottom
- Don't curl your wrists inward excessively
Common Mistakes
- Lifting elbows off the pad
- Using momentum to initiate the lift
- Shortening the range of motion
- Hyperextending elbows at the bottom
Muscles Worked
This exercise primarily isolates the short head of the biceps brachii, which contributes to the inner thickness of the arm. By stabilizing the upper arm in a flexed position, it also heavily recruits the brachialis and forearms while minimizing involvement from the shoulders.
Primary
Secondary
Get Personalized Coaching for Preacher Curl (Back-on-Bench, Dumbbell)
Don't guess your way through weights or workouts. Download Iridium for automatic, AI-powered coaching that adapts to your recovery and goals.