Dumbbell One-Arm Concentration Curl (On Stability Ball)
The concentration curl seated on a stability ball; the ball can roll, so the legs and the trunk have to hold the seat while the arm curls.
How to do it
Setup
Seated on a stability ball, feet wide and flat, leaning forward, elbow on the inner thigh, dumbbell hanging.
Steps
- Curl the bell toward the shoulder without rocking the ball.
- Keep the elbow braced on the thigh.
- Lower to a full hang; switch arms after the set.
Common mistakes
Feet close together on the ball: set them wide for a stable base. Ball rolling back as you curl: the hips stay still. Heavy bell that forces a lean: go lighter than on a bench.
Breathing
Exhale on the curl, inhale lowering.
