In yoga, awareness of the feet, the right support and activation of the plantar arches are very important factors for correct practice.

If, as B.K.S. Iyengar said, the body can be considered the temple of our spirit and the asanas our prayers, the feet can be compared to the foundations of this temple. If the foundations are not stable, strong and aligned, the temple is more fragile and collapses more easily.
Life in Iyengar Yoga. In this case, pada bandha refers to the activation of the plantar arches and this gesture is very important for the correct execution of the positions.
You must know that in the foot we can find 3 plantar arches:
Medial arch: goes from the base of the big toe to the center of the heel;
Lateral arch: goes from the base of the little finger to the center of the heel;
Transverse arch: goes from the base of the big toe to the base of the little finger.

To learn Pada bandha follow these steps:
Take Tadasana, spread your feet as wide as your hips and position them so that they are parallel (second toe in line with the center of the heel).
At this point, raise your toes and try to feel the activation of the foot and the 3 plantar arches I mentioned in the previous paragraph. The weight of the body should be in the center of the feet.
At this point he lowers his fingers trying to keep them as wide as possible, without losing the general activation of the feet.

It is important to activate Pada bandha especially in balance positions.