Courtesy Shutterstock

Forbes explains: “The 40% rule is simple: When your mind is telling you that you’re done, that you’re exhausted, that you cannot possibly go any further, you’re only actually 40% done.”

This simple trick is often used by Navy Seals to help them dig deeper than most humans are capable of. In that way, the human mind is an amazing thing. “It both propels us forward and holds us back,” Forbes concludes.

“The 40% rule reminds us that no matter how exhausted we might feel, it is always possible to draw on an untapped reserve of energy, motivation, and drive that we all possess.”