Agree, I have an irregular heart rhythm that put the brakes on my jogging/running regime and now I cycle as often as I can.
Welcome to the hearts and minds corner of the forum, Greybadger. I find that controlling my cycling output by my respiration rate is wonderfully efficient and has actually made me faster, not that I was ever very fast, you understand.
I currently ride a Whyte Stirling which is a revelation compared to the clunky Giant hybrid I had before.
Yes. I rode an expensive Peugeot mountain bike for years, in and out of the physio because the wretched thing wrecked my back, and I didn't even know enough about bikes to understand it wasn't my fault. Then, almost on a whim, I imported a Gazelle stadssportief, and it came as a revelation to me how comfortable a bike could be. Then I learned about bicycle components and geometries and fit, and started reengineering bikes I bought for other interesting technical features to suit me perfectly.
http://coolmainpress.com/BICYCLING.html For the last decade, rather than go out grudgingly, I can't wait to get on my bike. Fortunately my cardiac consultant is a cyclist too, who understands that it is the best form of exercise.
Andre Jute