Body is about the bodies formed by the soul in Vision Quests, and working/strengthening them. It is much less useful on the Physical plane, though seemingly effects can be projected onto it to a limited extent. Each spell has a greater effect which will take place on a Vision Quest and a lesser effect that will take place in the Physical world.
Magic is cast by tying knots in things on one’s person, representing the act of girding the spiritual body with armour. Casting a spell requires tying three simple knots. This may be performed in advance, a spell’s requirement is that at least three knots are tied about one’s person since the last spell cast.
Phys-repping of this is encouraged, though at a pinch without things to knot appropriate roleplaying may be performed with two hands instead taking 20 seconds.