Twist side to side and the obliques light up.
Rotate through your torso, not just your arms. Lift your feet for a tougher version.
Leaning back to 45 degrees puts your abs into a constant isometric hold while the obliques rotate the torso, each side driving its own twist in turn. There is no equipment and no setup, just your trunk fighting rotation and gravity at the same time. It earns its spot as the go-to rotational core move you can tack onto the end of any session, anywhere.
The obliques handle the twisting while the rest of your abs work overtime just holding the leaned-back position. It is rotation and an isometric hold happening at once, which is why sets burn faster than you expect.
Start with heels down until your reps are clean, then lift the feet to level up. Floating your legs removes your anchor and forces the abs to hold even harder, making every twist more honest.
Nine times out of ten you are slumping into a rounded slouch as you fatigue. Sit tall through the chest, lean back from the hips, and shrink the range of the twist. If you cannot hold the position, end the set.
