15 Simple Yet Effective Ab Exercises You Can Do at Home

The toe-touch crunch builds on the double crunch, adding even more engagement of your lower abs.

• Lie on your back and lift your legs and arms up so they're extended toward the ceiling.
• Lower your legs toward the floor while reaching your arms overhead, keeping your shoulders off the mat and lower back pressed into the mat.
• Crunch your arms and legs in, reaching your hands toward your feet (with your upper back off the floor), and your feet toward the ceiling. That's one rep.