Hi Matt, I really applaud you for your cycling and exercise generally, that is an amazing achievement. It's something i'd love to have a go at but I find with work and life, It would take up too much time and effort playing around with doses, insulins, experimentation. Tried it once, everything went pear shaped and there isn't much help from the hospital in terms of exercise. They just say everyone's different and they cant really help that much. I just can't fathom out what you need to do to exercise? The time I tried it, I ended up reducing my basal by about 50% and my boluses by 50% also. Then there was a knock on with doses on the following days I didn't exercise until my metabolism settled down again. For me it would have to be something you do everyday or not at all. It was really hard work, although perhaps with the libre it might be more do-able. b.t.w I do cycle to work, but I have an electric assisted bike, which allows a bit of exercise (10 miles a day) without impacting my doses, it also saves on parking, fuel and delays in traffic.