The idea for the XTrain series was born out of listening to everyone's feedback and suggestions about STS and another older favorite, Cross Train Xpress. XTrain takes the best of both STS and Cross Train Xpress and merges the two concepts, but of course with an updated approach and improvements.

Cathe Friedrich's XTrain has been uniquely designed to fit almost anyone's hectic schedule, and there are hundreds of ways the XTrain program can be done. This way you're not limited to just the regular 90-day program. For example: just like we did in Cross Train Express, each of the XTrain cardio workouts comes with several options to do a short (approximately 15 minute) single muscle group strength training workout at the end of your cardio workout. We've even added optional 100 rep challenges to every cardio workout as another strength training option. And of course, XTrain also offers multiple body part workouts just like we did in the original STS program, but this time we have reduced the time of the workouts and the equipment needed. So what do you get when you combine kick-butt cardio workouts with effective undulating weight workouts, great music, tons of premixes, detailed chapter menus, and beautiful filming? A system that stands in a league of its own: THE XTRAIN SERIES!!!

1. Strength and Toning - Upper Body
2. Strength and Toning - Lower Body
3. Calorie-Crushing Cardio Workouts