As they progress in their primary Nerve Fiber Building Cultivation the practice of the lying down meditation deeply relaxes them while building up high levels of BioEnergy .
Their primary Nerve Fiber Building Cultivation builds up their body 's entire nerve fiber system .
As they progress in their primary Nerve Fiber Building Cultivation , which builds up their body 's entire nerve fiber system , the practice of the lying down meditation deeply relaxes them while building up high levels of BioEnergy .