HOW: Drive one knee up at a time while moving your opposite arm up with the knee. Add a slight hop with the leg on the ground and perform this going in a forward motion for the prescribed amount of reps. It is key to make sure you get the rhythm of each small hop as you drive the knee up. Work on control and then speed as you get better!
FEEL: You should feel your leg muscles working, especially your calves and hip flexors.
COMPENSATION: Stay in an upright position, don’t slouch your back forwards. Don’t twist your hips as you move forwards, focus your movement on driving the knee up with the added hop from the opposite leg.