Call me crazy, but I'm the type of person who loves a workout that leaves me feeling instantaneously sore. When it comes to ab exercises, I feel the exact same way. I was bored of the ab exercises I had been doing — dead bug [1], plank with a clamshell [2], and rotational ball slams [3] — and then I remembered a move I did when I ran track in college: the seated knee tuck. I like this move because it challenges your balance and core stability and really works your rectus abdominis, aka the six pack muscles. If you're looking for a new move to add to your routine, try this.

How to Do a Seated Knee Tuck

• Start seated on the ground or on a weight bench. Place your hands about an inch behind your back with your fingers facing forward. Your feet should be on the ground.
• Lift both feet up off of the ground and extend both legs as you simultaneously lower your upper body. Be sure to get full extension at your hips and legs.
• With control, bring your legs back to your chest without touching the ground with your feet and return to the starting position.
• This counts as one rep. Complete four sets of 15 reps.