In my personal and not so humble opinion, you shouldn&#x27;t ride on public roads for fitness reasons. If you need to get from A to B, like from home to work, and you want to do it on a bike, fine. If you want to add some fitness routine to it, it&#x27;s fine too (your lungs would probably disagree) - but you have to focus primarily on staying safe and not endangering others.<p>But pure sports? There are parks for that.<p>Don&#x27;t get me wrong, I&#x27;m all for reclaiming cities for pedestrian and bike travel and creating a maximally energy-efficient public transport system (ironically, the best idea would probably be self-driving, publicly-owned electric cars forming a PRT network). But in current situation one has to stay pragmatic.