It's a "Side plank"!
This exercise really works your "trunk" and "abdominal obliques (flank)".Oh, so there's all kinds of planks? Maybe I should give it a try!Without rotating your back, make a line from head to heel.If the foot on top is hurting, it's no problem to lower it to the floor.Look straight ahead, don't angle your head.The elbow is put directly under the shoulders, supporting the body.If your elbow hurts, put a towel or similar down.Don't lower your hips or buttocks.Uguguu...Side-plank?Shigure, what exercise are you doing this time?