Weighted Reverse Lunge With Knee Drive
Start with your feet together and hold a set of dumbbells at your sides, palms facing inward. Take a large step behind you with your left leg and drop straight down toward the floor until both knees and hips make 90-degree angles. Push off your left foot, and as you extend your right leg, bring your left knee in front of you at about hip height. Step your left foot back again and repeat, completing all reps on one side before switching.