I speak here from personal experience and from what many of my clients did in terms of buying an exercise bike.
The idea seems great.
But I see that most people that buy exercise bikes end up losing interest in the bicycle.
It all starts great, and then you will have this white elephant that you will need to sell.
So my advice is to save your money and go for walks around your area.
That will be cheaper and more pleasant!
For more tips, read my books available on this website.
Would it be a good idea?