I love step classes. My gym has been phasing them out
Ok, back to your question:
Sarcasm! I find it the best way to handle rude and unnecessary comments about anything. Usually people are too speechless to respond and that lets you walk away laughing.
Examples of some I've done:
Person: You're fat!
Me: OH MY GOSH. I HAD NO IDEA!! IS THAT WHY I DIDN'T FIT INTO A SIZE 0?
Person: *slinks away as people look*
Person: You're eating
that? You'll gain the weight back!
Me: You mean eating fast food every day is BAD?? Why didn't anyone tell me?
Those are just the weight-related ones I can think of (I've had more witty ones, but I can't remember them right now). I'm kind of known for my mouth and always have been...just like in high school when my guidance counselors wanted me to apply for ivy league schools when I couldn't afford to. I asked them if they would pay my tuition.