OTF Studio Closed, Looking at Burn - first trial class tomorrow, have some questions

I've been an unlimited OTF member for many years and randomly our studio just announced they will be closing at the end of the month. Sucks, but figured this was a sign to try something new. I've wanted to incorporate more strength training and feel like this would be the best option.

Someone who has bad knees, but still does modifications 5x a week, would this be a good alternative? I was eyeing the 18-month contract since I would be going frequently for a fitness journey I'm on. My main question is, what happens to your contract if somehow you sustain a bad injury and are unable to workout with a doctors note? Are you able to freeze your account or what?

Thank you!