The “world’s greatest stretch” is popular for a reason—but the useful part isn’t that it magically stretches your entire body.
What this sequence actually does well is combine several movements in one flow: hip flexion, hip extension, thoracic rotation and a bit of hamstring/ankle mobility.
The rotation is especially interesting. As the front leg stays planted, the upper body rotates away from it, giving the mid-back some movement while the hips work to maintain the position.
That makes this a great movement prep drill before training, rather than something you need to force into a maximum stretch.
Keep the range controlled and use your hands for support if balance is an issue.
If you have an acute hip, knee, ankle or back injury—or sharp pain during the rotation—skip the deeper version and get appropriate guidance first.
You don’t need to chase the deepest position.
Smooth movement through a comfortable range is the win.