I really have liked this app for the most part, but something I find common to many apps like this is that they progress reasonably for about the first four weeks, and then jump running times unrealistically, even when you have absolutely been keeping up and working it faithfully. Example: Week Five, Day 1 has 5 min warm up walk / 5 min run / 3 min walk / 5 min run / 3 min walk / 5 min run / 5 min cool down. Week FIve, Day 2 goes to 5 min warm up walk / 8 min run / 3 min walk / 8 min run / 5 min cool down. And then Week Five, Day 3 has a 5 min warm up walk, / 20 straight minutes of running / and a 5 min cool down walk. Thats a HUGE jump in one week. And frankly, it makes me feel like quitting. I thought the point was to gradulally build up your endurance and skill. Debating about switching to a different app, or just parking on Week Three and living there. . . Are there ANY apps out there that really are suitable for middle-aged, non-athletic people who are working at liking exercise and being healthier? Thanks for a good first four weeks anyway. :-/