Hit the books and weights hard. Great opportunity to get grades and weight up. Missing a lot of school for baseball games and tourneys during the school day makes that difficult. Otherwise weights and long toss to stay fresh.
Like NYC, my 2021 is committed and isn't worried as much about reps in HS as he is staying healthy, and putting on good weight. Summer was limited for us, per GT pitching coach recommendation, focus on school and stay healthy and don't forget to still be a kid and have fun.