3 Flat-Ab Exercises From Shaun T — and All You Need Is a Chair

• Start in plank position with your hands on the chair and feet shoulder-width part. Bring your right knee to your left elbow. Squeeze the obliques as you twist. Place your right foot back into plank position.
• Switch sides and bring the left knee to the right elbow, and allow your pelvis to rotate so you can work your obliques as you twist. Place the left foot back and down to complete one rep.
• Continue alternating sides for one minute.

Shaun's note: Exhale on the work! Pull your abs to your spine as you bring your knee to the elbow.