The idea is to design an equipment that can stretch and twist your entire body.
I was thinking something like a circular table with padding on which the user lies. There are four appendages to the machine that grasp the hands and legs of the user just like Ironman's suit removal machine in Ironman 1. Here, the user assumes the position of the Vitruvian man.
For simplicity, let's say we use velcro to lock the legs below the calves and the hands at the wrists. The machine arms that lock the hands also have controls on them. The user can press a button and the arms of the machine move away from the table, pulling the user in four directions. Once released, the machine halts in the stretched phase. Another button brings the machine's arms back to the original position, thus, relieving the stretch for the user. The controls near the user's hand are for safety and independence. The user should not depend on outside help (or on minimum help from others).
The arms of the machine can rotate along the periphery of the table. The user can decide how should they be stretched. A button helps rotate the arms that hold the user's hands and they go apart from each other creating an angle between them. Similarly, a button decides the angle between the legs. The stretch then begins, again, entirely controlled by the user.
Another function of the machine is to rotate the legs together in one direction and the hands in the other. The amount of twist is again, controlled by the user using a button near their hand.
Reliability on the machine than manual help. The stretch
More power than humans, thus, giving the ultimate stretch. More power than gravity, so better stretch than hanging from a bar or using the inversion table.
More durable than Thera bands and tubes.
Higher manufacturing cost. Only clinics and gyms may afford it.
What do you think of the idea? Will it help any specific kind of patients? Will it help the physiotherapists? Can you suggest any upgrades?