This exercise is great for continuing to build on your lower limb strength.
Ensure you’ve mastered your squat technique using these exercises:
20 – Lower Limb Alignment: Mini Squat
22 – Lower Limb Alignment: Squatting

Then you can move onto the split squat and lunge in this video as well as:
24 – Lower Limb Alignment: Advanced Split Squat and Lunge