You get as much exercise on an e-bike as on a regular bike, you just go further, assuming you pedal and don’t just lean on the throttle. On a non-e-bike, my typically ride might be ten or twenty miles; on an e-bike I’ll go forty miles. For me, it’s much more fun.
My doctor told me to ride 40 miles a day. I called him a week later and said doc I’m 280 miles away!
RIP Rodney Dangerfield