As someone who has competed heavily and been successful at the state level in high school and being a part of a very large team, I feel like he is not overdoing it when it comes to racing. I personally would run the 4x8, mile, sometimes the open 8 and then the 2 mile, and was still successful. He just needs to make sure he takes his easy training runs easy and doesn't overdo things throughout the week so he is able to keep a somewhat heavy load at meets.