Hi Wendy! I'm not sure what you have to replace it with I will give you some suggestions and see if they work for you.
Low Max can be replaced with Low Impact Step plus a 15 minute brisk walk outside (or a 10 minute semi brisk walk on a mildly inclined treadmill).
Body Max one or two can be replaced with Step Jump and Pump (however, the intensity is a bit less so you may want to create more intensity where you can in SJP (ie: put step at 8 inches for step portion, or do more hi then lo during the hi/lo routines). Or you could set up a weighted barbell and do IMAX 2. After every 2 intervals in IMAX 2, pause your player and do one minute of squats, static lunges, plie squats, and finally static lunges again). Then do CTX upper body when your done.
Here is a peek at what I am talking about:
Imax2...do warm up and interval 1,2...pause and do squats for a minute
Imax2...do Interval 3,4 then pause and do static lunges for a minute.
Imax2...do Interval 5,6....then pause and do plie squats for a minute.
Imax2...do Interval 7,8...then pause and do static lunges for a minute.
Imax2...do Interval 9,10, cool down briefly and immediately do CTX all upper body, along with abs and a stretch.