User blog comment:Berserkchart486/Chakra Levels!/@comment-25152698-20151006111929/@comment-4080775-20151006143452

"chakra prowess and physical energy" prow·ess ˈprouəs/ noun 1. skill or expertise in a particular activity or field. AKA, Naruto's chakra usage, not chakra potency or chakra amount

Physical Energy = Vitality physical energy governs vitality, can be used to breathe life into form.