This post includes two bosu ball planks variations. Upper picture - stability challenge with alternating foot marches. Overall benefits of the versatile plank pose: strengthens core, reduce back pain, improves balance, improves posture, encourages muscles to work together, and burns more calories than other core exercises as it works multiple muscles groups simultaneously. Check them out in the picture below!
When done correctly plank can strength spine muscles, rhomboids, lats, trapezius, core, quads, glutes, hamstrings, shoulders and triceps as well enhance both wrist and ankle mobility. If you'd like to purchase one for yourself, head over here.