Question on children exercising

l y s h✌🏻 • Mama x 5 🤍 + 👼🏻👼🏻👼🏻

So my son who’s 11 has been trying out for a school volleyball team. He’s a semi active kids who plays at recess and outside most days but he’s not a team kid yet so I wouldn’t say he has much endurance. He can keep up on a decent hike or bike ride but isn’t the first one up the mountain. ;)

So my question .. he had his first tryout yesterday, which was an hour. And he woke up this morning pretty sore. And today he had another tryout after school. He then came home, had a snack, played basketball with his brother and then hit a wall. Came inside to read, barely ate dinner and then went to bed early thinking he was going to vomit. I know I’ve worked out hard enough before that I felt like vomiting but never hours later. Is this normal? Or maybe a sickness coming on? Wasn’t sure if the two days of exercise he isn’t used to could possibly cause him to feel sick?

:: tryouts are now over so he can rest. Thanks!