Some people believe that Jiu-Jitsu makes you tough, but there is no concrete evidence to support this claim. Jiu-Jitsu is a martial art that involves grappling and ground fighting, and while it can be quite physically demanding, there is no guarantee that it will make you tough. There are many other factors that contribute to someone's toughness, such as their mindset and personality. So, while Jiu-Jitsu may help you become physically tougher, it is not the only factor that determines how tough someone is.