The ides that one gets less exercise on an Electric bike is simply not true. To be sure, I personally get as much exercise on my e-bike as my body can stand. It is all in how I manage the assist system that determines the level of exercise one gets and wants.. If I didn't have that I would smell a lot less roses and view a lot less scenery because of much shorter rides..
I believe fooferdoggie was referring more to riding 'leisurely' as getting less excise.
To fooferdoggie's point, a leisurely ride likely burns around 250-400 extra calories per hour versus the 600-900 extra calories per hour a much more intense ride will generate.
For fooferdoggie: 250-400 calories of exercise per hour versus not riding, sitting at home, etc - is still a win in my books so I agree with teskow.
For teskow:
You're right in this post I just quoted about as much exercise if not more. I'm a living example. Even now after a year of getting serious in riding, I have found that when I do go out on my non-e bike I can ride at most for 2 hours, struggle on the steeper hills and only enjoy the ride mostly as it's great to compare to my previous year rides (non-e) and how I ride my ebikes. Yes I do burn right around 1000 calories/hour based on my bike computer/heart rate strap, therefore I get around 2000 calories burned in that exercise.
Note - my one non-e bike is a Specialized Fat Boy related to this thread.
When I go out for the day on my ebike Fat Tire bike I am still burning 650-750 calories per hour. I am able to ride for 4-6 hours, fear no hills, see so much more of the trails and areas I get to explore. I also achieve a 3000-4,500 calorie burn over these ride outs and it shows in my efforts towards weight loss.
Of course the bike computer/heart rate monitor equipment is estimate at best - I acknowledge this. The reality is regular leisure riding is better than no riding at all, ebikes allow those who would normally not ride due to concerns of tackling demanding hills in their area and such - to ride, and as I have found at least for me (and I suspect many others) riding an ebike will allow you to exercise more per day out riding than a non-e bike, at least until you are super fit and then the opposite might become true.
Cheers