So, I've made a start. It's a big step as I'm very unfit. I've just finished Run 2. I've been aiming to do 20 mins of exercise as I can't run for as long as the programme suggests and after 20 mins it's still showing that there's still work to be done - presumably because I'm so slow. Should I aim to finish the programme each time (but perhaps not running when it says, all the time) or run as much as I can but finish after 20 mins?