I'm a CrossFitter, and These Are the 12 Bodyweight Moves I Do For Strong Abs

Why I do it: Also known as AbMat sit-ups, since we usually place an AbMat cushion under our lower back when doing this move. It works the upper, middle, and lower abs, and is a great way to strengthen the abs when learning toes to bar.

• Lie on your back, and open your legs into a diamond shape (aka butterfly legs) with the soles of your feet pressed together and knees out wide. Extend your arms overhead.
• Inhale to curl your torso up, and tap the floor in front of your feet to stretch your glutes a bit.
• Slowly lower back to the starting position.
• This counts as one rep.