Yoga
As Sam observed the three divine wills, he found many postures and also the manipulation method to cultivate the body.
But that is not the discovery he was amused by.
The postures of the three methods are very similar to something he was familiar with in his previous life.
Yoga asanas.
The ancient yoga which originated from India, is one of the most favoured practices to keep oneself fit.
It is a practice that helps the body a balance between strength, flexibility and endurance. It is so common in his previous life that many people from young to old practiced yoga as daily routine.
But what he saw in the divine wills is not just yoga. The postures are completely similar to many complicated yoga asanas and they are extremely precise. But there is an attached breathing technique as well as the spiritual energy manipulation which when practiced along with the respective posture will cultivate the body.