Proprioception

The body's ability to sense its own position in 3D space. Eventually extends to an ability to sense the implied position of another person's position in space based on limited information.

Sufficiently powerful proprioception can infer the position of someone's limbs through contact with just their arm with closed eyes, for example. By feeling into the structures of their body and balance, U can know where they must have their limbs to support that configuration. One could feel a swinging fist through the contact with the other arm.