straight from head to heels (shown in the first photo).
Another version of this is a side plank, where the right hand is on the floor, aligned under the shoulders, while the left arm rests on the thigh, the body is lifted off the floor, and the legs are stacked one on top of the other.
Hold your position for 30 seconds to 1 minute. If performing the side plank, hold the position for 30 seconds, then switch to the other side (with the left hand on the floor, and the right arm resting on the thigh).
