Plank from knees ("Plank, kneeling; Core/scapular strengthening isometric; 01)

Start by lying on your stomach and prop yourself up onto your elbows.
Lift yourself up onto your knees, whilst staying supported on your elbows and keeping your hips and stomach off the floor.
Try not to lift your hips up too high in the air.
Hold this position for as long as you can.
Slowly lower yourself back to the floor and rest then repeat.