Since I'm so time-crunched these days, I'm looking for shorter workouts (less than 45 mins) and have been looking into 4 Day Split, Cross Train Xpress and Timesaver workouts as possible next purchases. I already have all of the Body Blast series of workouts so not sure if Timesaver is a wise choice for me. I'm interested in weights workouts as well as cardio (which I would have to modify to make the workouts mostly low impact). I would love opinions on all of these three sets. Please don't tell me to get them all!