Young dancers are training at a very vulnerable time in their lives, through adolescence, and while they are trying to work out who they are as people, never mind as a dancer. So train the whole person, not just the dancer.
I've always believed that the facts about dancing are more interesting than the myths, and this was a great chance for me to explore how the human body does such incredible things.
I always recommend a sensible diet, including lots of carbohydrates and avoiding too much fat. Dancers don't need different fuel from other people - they just need more of it because they use more energy.
I get to the theatre in plenty of time; I prepare my shoes in advance; I eat and drink the right things at the right time. The rest you have to leave to luck!