Seated twists tighten the oblique.
Implementation: (A) Take a seat on the end of a bench,
feet flat on the floor and placed apart. Place a broom handle across the back of
your shoulders and hold it. (B) Keeping your head still, and not allowing your
pelvis to shift on the bench, turn your upper body and shoulders in one
direction as much as possible. Hold this rotated position, now rotate your torso
and shoulders back toward the opposite direction as far as you can. Try not to
swing, make this a controlled movement. This keeps your oblique in shape without
adding bulk, since your not using any added resistance.