Also, nutrition is very important but at a certain point you just need the calories to burn so you can use the nutrients to build. Look at Michael Phelps' infamous diet for example. He ate a ton of food that isn't considered healthy by anyone. His body just needed the fuel with how much he was training. JJ Watt is another example. He was actually eating too healthy at the beginning of his career and found his tank running empty too often. The solution was to eat way more than he ever thought to. Ironically he wasn't consuming enough fats so he had to add that to his diet. Point is, nutrition for athletes is very different just because of the ammount of calaries being burned and needing to give your engine enough fuel to burn every day.