Don't just swing your legs; focus on "crunching" your ribs toward your pelvis.
How: Lie on your back with arms extended toward the ceiling and legs in a tabletop position. Slowly lower the opposite arm and leg toward the floor while keeping your lower back pressed firmly into the ground. Goal: Teaches pelvic control and protects the lower spine. Don't just swing your legs; focus on "crunching"
Goal: Builds the deep "inner" core strength necessary for visible definition. Don't just swing your legs