Hold the dumbbells with your arms/hands at your side and with your palms facing in – toward your body.
These can be competed standing or sitting, with both hands moving at a time, or hands alternating. For Alternating Hammer Curls, 2x Reps = 2x each hand, or 4x total.
Video link here and below: https://youtu.be/9_TAwb4ds_w