What is the 40% rule in Navy SEALs?
SEAL’s 40 percent rule states that when your mind tells you’re done, you’re only really 40 percent done. It’s a remarkable outlook, shared by marathon runners who, despite hitting a wall, manage to make it to the finish line. The 40% Rule is a mental toughness principle popularized by SEALs, ultra-endurance athletes, and high performers. The idea is simple: When your mind tells you you’re done, you’re really only 40% spent. That means 60% of your capacity is still untapped. David Goggins, one of the toughest humans alive, swears by it.
What is the 120 rule in diving?
The rule suggests that the depth of the dive (in feet) and the time spent underwater (in minutes) should not exceed a combined total of 120. The goal of this rule is to keep divers within a range where they can avoid serious risks such as nitrogen narcosis and decompression sickness. A good rule of thumb is to ascend no faster than 9 meters per minute (about 30 feet per minute) and always make safety stops. Avoid Multiple Dives If you’re planning multiple dives in a day, be cautious about the depth and duration of each.Here’s how it works: Your max depth (in feet) + your bottom time (in minutes) should be less than or equal to 120. That’s it. So if you plan to dive to 60 feet, the rule says you shouldn’t stay down longer than 60 minutes.