Lunges mainly work your glutes, quads and hamstrings.
Basic Lunge Form Cue
Take one huge step forward, and keep your feet in line with your hips. Try to keep your torso perpendicular to the floor as you sink down into your lunge. As you lunge, watch the front knee to make sure it stays stacked above the front ankle. As you rise, actively think about trying to squeeze your legs together.
Reverse Lunge Form Cue
Take a big step back to come into a lunge position. Watch your alignment and make sure your front knee is stacked over your front ankle, and your chest is lifted with a tight core. Step back to starting position.
Reverse Lunge with Kick
Use your core to lift your leg and flex your foot to press it away from you. Keep your chest lifted and torso upright as you lunge. Finish on one side before switching to the other side.