I did bikram yoga for 2 weeks everyday straight an my back didn’t kill me one bit , but I do yoga regularly so my back is pretty strong as it is, but you should do lots of yoga beforehand
I wish I did this! As we are having the same size I would advise you to do some work on your back area because sometimes, particularly at the end of the day, I feel such a hard pull on my shoulder/back muscles and it hurts x