Ok - o was getting a little down making no progress with the App so decided to change things up a bit. Did a 10 minute walk to warm up instead of the 5 and found I was able to do a 15 minute run without problem after. I am now adding a minute to that time each time I go running to build up. Also found that me knee has been giving me less problems since starting this approach. Am I doing the right thing or should I go back to the C25K program???