12 Moves to Build a Stronger, More Functional Core

"This slow-paced exercise allows for core engagement throughout," says NASM-certified trainer Keisha Villarson. "It also exercises the entire core, activates the transverse abdominis, and builds spine stability."

How to Strengthen Your Core With Dead Bug Crunches:

1. Lie faceup on the floor with your knees bent at 90 degrees and stacked directly over your hips, so shins are parallel to the floor. Extend your arms up toward the ceiling.
2. Reach your right arm next to your ear, and extend your left leg toward the floor, stopping when it's a few inches above the floor. Keep your lower back flat on the floor.
3. Pause, then return to the starting position. Repeat on the other side. That's one rep.