I always start with the baseline obligations. 1 - show up for practice. On time, ready to train 2 - daily test my waking HRV, health and weight 3 - record my workouts, review the data and work out where I can get a gain. A lot of mental toughness is based on training your discipline muscle. If you cannot do these three, you won't be a professional athlete (that anyone wants on their team) for long. After you have the basics mastered, raise the bar. Learn about 1% improvements. Workshop where you can make your changes. Set them out in a 2x2 grid based on Easy/hard to do and speed to implement. Start on the easy to do, fast to implement. Then stick to making those improvements.