This 10-Minute Abs and Butt Workout Will Leave You the Best Kind of Sore

You might recognize this core exercise from Pilates, where it's often called a scissor or single-leg stretch.

• Start lying on your back on the floor with your legs extended toward the ceiling, straight above your hip joints. Place your hands behind your head, elbows wide.
• Curl your upper body to lift your shoulder blades off the floor, engaging your abs and keeping your lower back flat against the floor. This is your starting position.
• With control, lower your right leg until it's a few inches off the ground, or as close as you can get. Make sure your back stays pressed against the floor and engage your core throughout the move.
• Lift your right leg to the starting position while simultaneously lowering your left leg toward the floor in a scissors motion.
• That's one rep. Repeat for 30 seconds.