Turbo Fire what's it like?

RachelsReboot

Do you do turbo fire? What is it like? I have it but don't have hours to sit down and go through it at the moment. I couldn't do level 2 of 30 DS, I have a bad knee and it was killing it. I am doing some things to strengthen my knee and hips (doc said stronger hip would help the knee?) but I am bored with my current cardio routine and looking to start something new. Does turbo fire have modifications to any of the higher impact exercises? It's mainly jumping that kills me.