Not a nice experience, was only out about 5 mins and very hilly, took my time but when I got off I was quite light headed and my eyes weren't right because of it....I suffer labyrinthitis, anxiety, I think low blood pressure and get palpitations so not looking good. I'll phone the doc tomorrow and see what he or she says. I read some stuff on the net saying "light headed when exercising" ,and nearly everything said be very careful and see the doc before anymore. I know exercise its suppose to be good and healthy, but maybe not all the time, see what happens