Execution:
1
Seated on a bench, hold a dumbbell in each hand with a supinated grip.
2
Perform 7 partial reps in the bottom half.
3
Then 7 partial reps in the top half.
4
Finish with 7 full-range reps, with the torso supported and braced.
Tip: seated prevents body swinging — forcing all the work into the biceps.