single leg bridge with outstretched leg

Lie on your back with your knees bent and feet flat on the ground. Extend one leg straight out in front of you. Engage your glutes and lift your hips off the ground, forming a straight line from your knees to your shoulders. Hold for a moment at the top, then slowly lower your hips back down to the starting position. Repeat for the desired number of repetitions, then switch legs.