The goal of this exercise - Strengthen the quads, glutes, hamstrings, improve lumbo-pelvic stability, and balance.
All reps should be performed on the weaker leg first before switching sides.
Start off in a split stance, one foot forward, hands at your sides, core braced. Keeping your center of gravity in the same place, draw a breath into your stomach and try to lower yourself down to your full depth as you drop your back knee (a range where you are able to maintain proper form).
Once you reach your bottom position, return to the start by squeezing your glutes, pressing your front foot into the ground while breathing out.
Aim to keep your knee in line with your foot, not allowing it to fall inward or outward.
Your front leg should be doing most of the work. Make sure that you engage your quad, hamstring, and glute of the front leg and push up, versus pushing backwards and transferring your weight to your back leg. Your body should travel in a relatively vertical path the entire time.
To make this move easier -Widen your feet. You may also hold onto a suspension system such as a TRX to help assist your legs.
To make this more challenging: Elevate your rear foot onto a bench or chair or hold weights at your sides while keeping the same form.