Step one foot out so your knee is behind the plane of the front of your foot. Drop down into a lunge, keeping most of the weight on your front leg. Push up through your heel, as you breathe out. Keep a tight core and a neutral spine.
Helpful tips and Tricks
Make sure the you stance (of your feet) is not in line with each other. It should be about width of your hips. Super slow reps make this much harder.