Stand with feet slightly more than shoulder width apart, with toes pointed outward.
Squat deeply, keeping the knees over the ankles and the pelvis tucked in. Keeping the weight on a planted foot, come out of the squat raising one knee up towards the ceiling.
Bring the foot back down and go into the next sumo squat. Alternate legs on each squat.
For added resistance incorporate Body-Solid tools Ankle Weights, Weight Vest, Dumbells, Kettlebells, or Medicine Balls.