Execution:
1
Sit tall and hold the dumbbells with a neutral grip (palms facing each other).
2
Perform 7 partial reps in the bottom half of the range (bottom to mid).
3
Perform 7 partial reps in the top half (mid to top).
4
Finish with 7 full-range reps.
Tip: keep the neutral grip throughout — that's what makes it a hammer variation instead of a standard curl.