How to do a single-arm dumbbell overhead lunge:
- Stand with the feet hip-distance apart, holding a medium-size dumbbell in your right hand.
- Press the dumbbell overhead, locking your elbow.
- Step the right foot forward into a lunge position, so both knees are at 90-degree angles and your left knee just taps the floor.
- Step the right foot backward next to the left foot to return to the starting position. That's one rep.