Body Tempering with the Heavy Sword

The methods of sword training are set in stone too: use the heavy sword to train the body and hone the sword heart, a bit like working out your pulse at the gym. Cultivating the dantian is even more detailed: sit in oblivion, undergo vacuum decay, evolve chaos, the universe, the Great Dao, the demon gods, and Pangu splitting open the heavens, then finally return from acquired to innate.