Hi there, my name is Kim and just exploring this app for the first time. I am Turning 50 this heat and very new to running and exercising. I am on a weight-loss journey for several reasons: age, health, and getting married in August. I have really bad knees, ankles and major back issues. I’ve had surgery on my ankles and November 2017 surgery on my back for bulging and herniated disc’s. I started working out with a trainer about four weeks ago, and all of my friends seem to run and 5K and 10K runs. There is a local run that is really popular where I live coming up in April. They have a 3K and a 10 K and I’ve decided that I’m going to run in the 3K as my first race. I have been reading over a lot of the information here and it’s all great. I do have one question: I have a hard time running outdoors as it really Jack’s up my back and my knees. Following the running structure on this app, can I alternate running indoors on a treadmill and outdoors? Or is this app meant to be for running outdoors? Thank you and I look forward to achieving this goal.