HOW: Start by grabbing two dumbbells of the same weight. Take a step backwards with your left leg and descend into a lung position. Push yourself back up and backward using your back left leg. Then repeat on the right side. The key is that you are pushing yourself up with your back leg, not your front leg!
FEEL: You should feel all the muscles in your legs working, but especially your quadriceps muscles. Your back leg should be doing most of the lifting.
COMPENSATION: Do not push too much through your back leg. It is OKAY for your knees to go past your toes - that is normal!