When I started the programme about 12 weeks ago the 5 min brisk walk tired me out and made my legs ache. I was unable to run for more than 20 sec in one go. I now can run for 40 mins I am not that fast but am working on this with the stamina podcast of running to the beat. I usually run every other day come rain or shine at 6am before work and love it. Why didn't I do it before it acts as a de - stressor and got rid of any aches and pains.