In straight arm side plank raises, start in a side plank position with your body supported on one straight arm and your feet stacked. Lift your hips upward to form a straight line from head to heels. While maintaining this position, lower your hips towards the ground and then raise them back up. Repeat for the desired number of repetitions, then switch to the other side. This exercise primarily targets the obliques and lateral stabilizing muscles, while also engaging the shoulders and core for stability.
