The Single-leg Side Plank is an advanced version of the standard side plank. This exercise improves lower back endurance while targeting the obliques and hip abductors.
Lie on your side and position yourself on your bottom elbow and side of your foot. Raise your hips so that they're off the ground and your body forms a straight line from your ankles to shoulders. Brace your abs.
While keeping your torso stable, raise your top leg upward without bending your knee. Hold this position for the recommended time and then return to starting position.