New girl with back problems

Hey there 😊 so my sister has convinced me to try FB. Im really excited and just purchased the FB low impact program. However.. I have always had back problems since a surgery back in 2009, but in the last 3 months i have been waking up every single day with lower back pain. I was hoping this program would be a great start to my fitness journey. Just wanted some feedback from those who have done this program.. if my back would be able to take it? Would appreciate anything... thanks 😊