Oh and I would really like to add, sick children do not belong at gymnastics practice period. I am still amazed to this day but what parents will do!
Case in point, I was teaching a rec. preschool class and this little girl comes in late (already started stretch and had 6 others) she is usually a good child and doesn't complain and she would not stretch so I asked her what was wrong, she said it hurt, I get this a lot for anything at this age (bug bites, scrapes, had a shot earlier) so I asked why and she said "My whole body aches." I asked if she was sick and she said she has an ear infection and a fever, although with the body aches I would venture to guess she also has some other type of virus as well. So I told her to go tell Mommy to take her home because your too sick and to schedule a make up in the office when you feel better. BTW this class ran like 8 or 9 times a week so making up shouldn't be a big problem. She left and came back a few minutes later and told me "Mommy says I have to stay" I am like are you kidding? We then went to tumble and turns out the girl is dizzy as well (no duh with the ear infection) so when she could not do any skills I again told her to go tell her Mom to take her home and I will talk with her later. I couldn't stop class with 6 others kids to myself to go talk to her. And again she comes back in and tells me she can't, so I had her sit out. I had words with the Mom who told me it was none of my business what she does with her child and that she just has an ear infection and it is not contagious to others. Also keep in mind this was a 45 minuet preschool class not training for the Olympics.
The worst is I told this story to another Mom at the gym and she got mad at me saying well ear infections are not contagious, (not exactly the point, doing gym with infected off balance ears is dangerous) I send Sally to gym all the time with them, and I get mad when daycare won't take Suzie because she has a fever so I load her up and Tylenol and drop her off! I love todays style of what I like to call passive parenting, I will have the kid but I want a life too and I won't let the kid get in the way of that.
I have also had a lot of "I didn't go to school today because I was throwing up." erm but you are at gym

"yeah my Mom said I could do gym if I felt better." Me-are you freaking kidding?
The first year I coached I got sick 14 times that year, and I am the queen of hand washing, Hand sanatizer, Lysol, taking vitimans, and never touching my face. Sorry for the rant I just don't get what people are thinking sometimes.