Offline mode for training

I am new to zwift so it is possible I have just not seen this feature yet. I am both a runner and a cyclist but only have setup for indoor cycling. It would be nice to have an offline mode or an ability to upload an excercise for use with the training feature. I am not particularly looking to gain points from running on the road but having it count towards a multi-excercise training program. I am on Garmin and it would be nice to backflow an excerice into zwift even if it doesnt work towards points towards a new hat or cycling shoes.