I ride an eBike because it allows me to choose how much I want to stress my body without constraining how fast I go. Biking for me is about fun combined with fitness. The eBike gives me the tool to fit both in to my satisfaction. My personal philosophy of fitness doesn't focus on cardio. I have another sport that I've been participating in all my life life provides a full body workout. So cycling isn't a critical source of fitness for me.