The levels of body cultivation in the Mortal Realms were as such:
Body Strengthening, Flesh Tempering, Viscera Consolidation, Muscle Strengthening, Bone Forging, Pulse Refining, and Marrow Cleansing.
Each level focused on a different part of the body and evolved it beyond its human capabilities. Both physical strength and defense would be boosted to a degree by every completed step, but the main reason people practiced body cultivation in the mortal realms was not power.
At the beginning, body cultivation could not compare to energy cultivation. The amount of potential that both paths had was about the same, but the true benefits of body cultivation would only reveal themselves once a cultivator reached the Immortal Realms.