You were locked in a gym and forced to exercise! This is The Patriarchy Police in action entrapping and compelling women to attain impossible body sizes just like they warned us! A similar thing must happen to fat people where they are locked in fast food restaurants and forced to eat until reopening time! I can't believe I was wrong this whole time.  Seriously, I wouldn't put much fault anywhere. Seems like a case of shit happens and no harm done. It's weird they wouldn't do a check or turn off the power, but it's also a little weird you didn't notice. /Shrug. Hopefully they don't arrest you for stealing exercise!