Start in an elbow plank position with your shoulders over your elbows and your shoulders, back, hips, and ankles in a straight line.
Keeping your abs engaged and your pelvis parallel to the floor, raise your right foot off the floor a few inches or as high as you can while maintaining a neutral spine.
Slowly lower your right foot back to the floor.
Repeat the leg lift on the left side.
This completes one rep. Perform as many reps as you can in 30 seconds.