OK, sorry it's not a great motivational title, but here's the deal:
I lost a good bit of weight (15kg, a couple of stone) about eight years ago by changing my food and exercise habits and kept it pretty stable (+/- 2kg) ever since. In August last year I started C25K on the advice of a friend to try to get fitter, not just lighter.
Since then I've got fitter - I can run 6k without being out of breath - but I've piled on weight and it's not stopping. I add a solid ~1kg per month, and my run times over the same 5km circuit are getting slower and feel so much harder. Six months ago I did 6.1 mins/km, now it's 7.7mins/km, increasing run by run. My weight has soared in the same time, week by week, now up 10kg. So from a physics POV it all makes sense: speed is inversely proportional to mass, so more weight means more effort and a more miserable experience every time.
So I'm considering giving up.
If eight months of signifigantly increased regular exercise means I'm a lot heavier (increased risk of diabetes) but a tiny bit fitter (will love longer to enjoy that) then I'm afraid it's not for me. My plan is to stop until I've had the chance to discuss this with my GP and then decide what to do next.
I appreciate that most here have had a truly wonderful experience of running, and I don't want to detract from that for a second, but I'd appreciate the views of anyone in the same boat, if anyone in that situation is still here.