So, I'm really interested in learning to run with this app, but I have a few concerns about my health. A little under a year ago, I started having back problems and found out that I have 3 herniated discs in my lower back. Since the discs are meant to help with absorbing to shock from running and bouncing and all that, I'm afraid of hurting myself or causing these problems to get worse. Does anyone have any tips on how to not hurt myself, or maybe make running have a little less impact on my spine?