If you have to miss a class or two, your fitness level doesn't have to suffer. You can make up the class at your convenience.
Bonus! You can use the warm up and/or the stretch portion of any of the recorded classes before or after your own activities so all your activities are safe and effective. Or simply do these portions of the recorded classes on their own when you need a quick boost.
As a subscriber you can simply click on the emailed link and do the workout at any time, on any day that works for you.