Plank full stretch ("Plank (low)" Core/scapular strengthening isometric; 03)

The plank strengthens your back muscles.
Start by lying on your stomach and prop yourself up onto your elbows.
Curl your toes under and lift yourself up onto your feet, while staying supported on your elbows keeping your body in a straight line.
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