I too am trying to lose weight and get in better shape. The weight loss has been slower than I'd hoped, but I'm down about 4kg since Fall and recently I've noticed that my clothes are getting loose. So today I tried the next size smaller. Yep. They fit. A bit snug still, kinda like the size I'm in felt 6 months ago. I'll wait another kilo or two before down-sizing my wardrobe, but if it hadn't been that the cheapest pair of pants and the best colour was in my "old" size, I might have got a smaller pair already today. And ... I no longer feel like I'll pass out at spin class, I did 43 miles into the wind a few weeks back, and I climbed about half of Ben Nevis (got stopped not by my lungs, heart, or legs, but by my fear of heights). So yes, definitely, biking is a good way to get back in shape!