I am now in Meso 2 of STS. I am concerned about the Legs section in Meso 3; I have been having trouble all along with each Leg workout, mainly because I cannot bend my knees below 90 degrees, because of my hip replacement. Also, I have scoliosis, and I am a bit off balance. I use a balance stick along with a weight with most lunges, and the elevated lunges are especially difficult. In Meso 3, the choices are using a squat rack (which I do not have) or Plyo. Too much jumping is not good for my hip or back. Does anyone have any suggestions for modification when I get to Meso 3?