Hold the dumbbells by your sides, keep your palms face inward toward your body as you curl into a hammer curl, return, then perform a regular curl as you rotate your wrists from the bottom to have you palms facing your shoulders at the top. That is 1 full rep!

Weight Recommendations:

Beginner: 3-7lb dumbbells

Intermediate: 10-12lb dumbbells 

Advanced: 15-30lb dumbbells