I personally think that e-biking is really healthy for lots of reasons, for myself it means I get to have total "me-time" on my ride to and from work, I find it's a good way to clear my mind as you do have to concentrate on the road, and to think about nice things.
I pedal as hard as I feel like at the time and try only to use the electric sparingly, however, I do find it hard to pedal totally without any electric as I'm usually carrying a medium load. I'm sure that it helps tone my legs and rear and it reduces my appetite when I do cycle. It certainly stops me snacking on the way home. There is a very tempting vending machine right by my bus stop at the hospital where I work and when the bus is late, as it often is when I decide to go by bus, the chocolate bars seem to jump straight out into my pocket to soothe the journey home! Whereas when cycling it's straight out to the bike shed, load up and off I go, sailing past all the stationary traffic and people waiting at bus stops.
For my husband it has been a life saver, he absolutely loves the freedom of his bike, he pedals when he can with all his ailments, and it seriously helps him exercise with his rheumatoid arthritis and heart conditions he feels this is helping him to maintain his weight and it is his only form of sustained exercise as he is unable to walk very far. The bike also gets him out and about to interact with people he would not normally see during the day as we live in a quiet area (well it is quiet out of season time) and this in turn raises his spirits.
Best of all we enjoy our weekend trips together which again keeps us both out of the armchair, and the kitchen, so even tho' we are not cycling totally under our own steam, we are out there in the fresh air and moving around regularly.
Some of my colleagues at work have said that e-biking does not count like conventional cycling, however, I have learnt to ignore them. It's usually those that don't cycle who make such comments.
If only the weather was more predictable, and in particular, dry every morning and evening when I go to and from work !!! - however, if it never rained there would not be so many beautiful things to see and smell on my journey.
I have never been to a gym, I used to go to dance aerobics years ago, however, I never seem to have the time or energy these days and with my bad foot I find cycling is within my capability, it is also wonderful to incorporate my exercise into my commute to work.
Jeanette