Instructions
Find a comfortable position on a leg-press machine with your feet placed, flat, about shoulder width apart.
Extend the resistance away from your body until your knees are at an almost locked position (never fully lock your knees).
Further extend the platform away from your body, by driving your toes forward, into a tip-toe position.
Hold this fully-extended position for 1 second, before lowering the platform to your extended-leg, flat-footed position.