Theres more then one way
 

There’s only one way to do the perfect squat (or lunge).
“I continue to hear personal trainers and fitness experts who say there’s a single way to do a lunge or squat. I see them correcting chest alignment and where the knees line up with the toes or ankles. This fails to take into account physics and the person’s goal. There are thousands of different ways to do a lunge. What’s your goal? Strengthening the top of your thighs versus toning your thighs requires very different movement