Stand tall with your feet hip-width apart. Hold a dumbbell in each hand by your sides.
Step forward with the right foot and bend your knees to lower into a lunge until both knees are bent at about a 90-degree angle. Try to keep the front knee directly above the ankle and lower the left knee to hover just off the floor.
Holding this position, bend your elbows to curl the dumbbells up to your shoulders in a biceps curl.
Lower the dumbbells, then push off your front foot to step it backwards and next to your other foot, returning to the starting position. That's one rep.