Seated One Arm Dumbbell Palms Up Wrist Curl

The seated one-arm dumbbell palms-up wrist curl is a single-joint exercise that isolates the wrist flexors on the palm side of the forearm. With the forearm braced on a bench and the palm facing up, the wrist is the only joint that moves, which removes the elbow and shoulder from the movement and concentrates load directly on the flexor muscles. It is a common finisher for forearm and grip training after biceps or back work.

Muscles Targeted

• Primary: Wrist flexors (flexor carpi radialis, flexor carpi ulnaris, palmaris longus)
• Secondary: Flexor digitorum superficialis (grip contribution)
• Tertiary: None significant

Starting Position

Sit on a flat bench with feet planted on the floor. Hold a dumbbell in one hand with your palm facing up, and rest your forearm on your thigh or on the bench so your wrist hangs freely just past your knee or the bench edge. Let the dumbbell roll down toward your fingers so the wrist is fully extended, keeping the forearm pinned in place throughout.

Execution Steps

1. Set your forearm flat against the bench or thigh with only the hand and wrist free to move
2. Let the wrist extend fully, allowing the dumbbell to roll down toward your fingertips under control
3. Curl the dumbbell upward by flexing the wrist, driving the knuckles toward the forearm
4. Squeeze at the top of the movement for a one-count hold to maximize contraction
5. Lower the dumbbell slowly back to the fully extended starting position, resisting the weight the entire way
6. Complete all reps on one arm, then switch to the other side

Form Cues

• Isolate the wrist: Keep the forearm glued to the bench so no elbow or shoulder movement assists the lift
• Use a full range of motion: Let the wrist extend completely at the bottom before curling back up
• Control the descent: The lowering phase builds as much of the flexor strength as the lift itself
• Use a light-to-moderate weight: Wrist flexors are small muscles that fatigue quickly under load
• Keep grip relaxed enough that the dumbbell can roll into the fingers, then re-grip as you curl

Common Mistakes

• Lifting the forearm off the bench: This turns the exercise into an arm curl and removes wrist isolation. Keep the forearm pinned down throughout.
• Using too much weight: Excess load limits range of motion and shifts stress onto the smaller hand and finger muscles. Choose a weight that allows a full, controlled range.
• Bouncing the weight at the bottom: Rebounding out of full wrist extension reduces tension and risks strain. Reverse the movement smoothly under control.
• Rushing the tempo: Fast reps rely on momentum rather than muscle tension. Slow both the lifting and lowering phases.
• Neglecting full extension: Stopping short at the bottom shortens the range of motion and limits the stretch on the flexors. Let the wrist fully extend each rep.

Variations

• Two-arm barbell wrist curl: Trains both forearms simultaneously with a barbell across the knees, useful for time efficiency
• Reverse wrist curl (palms down): Targets the wrist extensors on the back of the forearm for balanced development
• Behind-the-back barbell wrist curl: Standing variation that increases range of motion and grip demand
• Cable wrist curl: Provides constant tension through the cable rather than gravity-dependent resistance
• Zottman-style wrist curl: Alternates palm orientation mid-set to hit both flexors and extensors in one exercise

Tips for Progression

• Increase reps first: Build up to 15-20 controlled reps per arm before adding weight
• Add small increments: Forearm muscles respond well to modest 2-5 pound jumps rather than large jumps
• Slow the eccentric: Take 3-4 seconds to lower the weight to increase time under tension without adding load
• Add isometric holds: Pause for 2-3 seconds at full contraction to intensify the finishing squeeze

Training Notes

Include this exercise 2-3 times per week as an isolation finisher after your primary arm, back, or pull-focused training, allowing at least a day of rest between sessions targeting the same forearm. Work in the 12-15 rep range per arm for 2-3 sets, resting 30-60 seconds between sets since the muscles involved are small and recover quickly. Pairing it with a reverse wrist curl in the same session balances flexor and extensor development.