Today the Amazing Stickie is working on multiple things at once, as she often does. She’s challenging her core strength by working in quadruped position while also working her arms in the quadruped lateral raise.
She begins on her hands and knees, ensuring that her knees are directly under her hips and her hands, holding light weights, are directly under her shoulders. She raises one arm directly out to the side until it is parallel to the ground and then lowers it back to starting position. Then she repeats on the other side. (For less of a challenge, do all the reps on one side first and then switch.)
A set of ten is usually sufficient.