Lunge Slide - The Lumbar Yard

Stand with feet hip-width apart, the ball of the left foot resting on the gliding disc.
Bend the right leg while sliding the left foot backwards into a lunge position.
Keep the front knee behind the toe and keep the back leg slightly bent.
Slowly slide the left foot back to start, pushing into the disc and repeat and switch sides.
Keep the weight in the front leg so you always have control of the foot resting on the disc.