First of all as I have said several times over the years in this blog mental toughness is a figment of the imagination. Throwing a bunch of exercises together in a circuit and calling it mental toughness training is just an excuse for doing stupid stuff. Getting tired is not training. Those kinds of workouts teach the athlete to go through the motions, to click their brain off, actually the opposite of what you want mentally. Because you see it all the time does not make it right. Training must be mindful not mindless. A good training session demands mental concentration, intensity and focus. Anyone can make someone tired but that is not training. Focus on what the athletes needs to do to get better to perform at their optimum in competition.