Hammer curls are just bicep curls in a position with your palms facing your thighs. It activates your bicep muscle slightly different. It is also a good alternative if a regular curl (with your arm externally rotated) bother you for any reason. This position is more stable for the shoulder and elbow joints. Great arm toner!
Related workouts
Tricep Extension with Resistance Band
Straight Arm & Forearm Plank
2 Minute Plank Series
UPPER HIIT Mix – Med Impact
Hold it. Pulse it.
Sumo Squats
Standing Row with Resistance Band
Day 7 Spring Reset – HIIT & Upper Body
Half Superman