Roll out at an angle, obliques scream.
Drive the return from your core, don't let your lower back sag as you reach.
Rolling the straps out and to one side turns a standard rollout into an oblique problem, your core resisting extension and rotation at the same time as the angle drags your arms off centre. The return is where the obliques earn their money, pulling your entire kneeling frame back against the diagonal line of the straps. It deserves a spot because most oblique work is either twisting crunches or static holds, and this trains the far more useful skill of resisting force while long and loaded.
The sideways reach. Rolling out at an angle adds a rotational pull the straight version never has, so your obliques have to work alongside the usual anti-extension demand.
A modest angle is plenty, the diagonal multiplies the difficulty quickly. Reach only as far out and across as you can return from without your hips twisting or your back arching.
Almost everyone has an oblique imbalance and the alternating format exposes it. Match your reps and range to the weaker side until it catches up.
