Single Arm Dumbbell Overhead Reverse Lunge Stand with your feet hip-distance apart, holding a medium-sized dumbbell in your right hand. Press the dumbbell overhead, locking your elbow. Step your right foot back into a reverse lunge position so both knees are at 90-degree angles, and your right knee just taps the floor. Step the right foot back to complete the rep. Complete as many reps as you can with correct form for 45 seconds. Take a 15-second rest. Image Source: Getty / yoh4nn