Blue tide is good. Blue Sea Tide Tactics and Eight-step Vajrayana Skill are both good health-keeping and fitness methods. Blue sea tide tactics is a dynamic skill, which can enhance the endurance and flexibility of the body and promote the blood circulation and metabolism of the body. Eight vajrayana kungfu is a kind of static kungfu, which can help practitioners improve their attention, but it can't improve their health. So, the blue ocean tide is good.