Having gone through the NHS programme twice due to injury, and now that I'm fixed up again (podiatrist this time) I'm branching out into c25k Zombies, Run! I find running slowly in order to get back to fitness pretty boring, but the bad acting on the app is keeping me amused.
I think it's still wisest to stick with the NHS programme if you are starting out, but I do like the way this version integrates strength and stretching. Uuuuuuuungh