Dumbbell One Arm Concetration Curl (on Stability Ball) is a curl variation using a dumbbell. A controlled curl using a dumbbell to load the biceps. Suitable for most training levels since the load and range are easy to control.
Log your dumbbell one arm concetration curl (on stability ball) sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.