Lean, rotate, and fight the straps.
Keep your hips square and let your trunk do the turning, not your arms.
Standing side-on with arms long, you rotate away from the anchor and the straps immediately fight back, loading your obliques through the full turning arc in both directions. The trunk does all the turning while the hips stay square, making every rep a lesson in separating torso rotation from hip swing. It earns its place as rotational core training you can dose precisely, a step closer to the anchor adds resistance, a step away takes it off.
The core, obliques front and centre. They power the turn away from the anchor and control the loaded return, while the straight-arm position stops your arms stealing the work.
Lean further away from the anchor before you start. The steeper your lean, the more bodyweight loads the straps and the harder your trunk has to work through the turn.
Because the moment your hips join the turn, the rotation stops coming from your core. Pin the pelvis, turn the ribcage, that separation is exactly what the exercise is teaching.
