Sprinter Start: Step 1
Start with your front foot and back knee on the ground in a "short lunge" position and toes of back foot tucked under. Fingertips should be on the ground a little wider than shoulder width in front of the foot. Keeping the front foot still, straighten both legs by pushing the hips up and back. You will definitely feel your hamstrings here! Then just bend both knees again to return to starting position and repeat.