As someone who trains and fights in Muay Thai I’m forever coming home with injuries…you aren’t doing it properly if something doesn’t ache the next day.
Impact injuries from sparring are common, I’ve sprained my toes a number of times, and i get bruises/scratches quite a lot. I’ve never broken anything…although I had my toe x-ray’d once when I thought I had.
People tell me that chicks dig scars, but my wife doesn’t seem to like it.
I’ve only ever sparred ‘hard’ with someone through mutual consent, often when either one of us is training for a fight, but even that is controlled and not 100% – you don’t want to get an injury before a fight. I would never go hard on someone with 6 months training, and I know our instructor would tell off anyone who did. If anyone gets carried away, he’ll often tell the person that they’re sparring with him next if they don’t pack it in.
We once had a couple of new people join who obviously had some experience and thought it was funny ‘beating up’ the people new to sparring. They were laughing and egging each other on…they didn’t take any notice when the instructor told them to calm down.
They then got partnered with one of the pro fighters (MMA fighter, or ‘cage fighting’ if you prefer), he proceeded to ‘spar hard’ too…they didn’t come back the next week.