They were brill at out health centre, first thing they said when they saw I'd ticked Diabetes on the form was - look, bring your meter and Lucozade (or whatever you use) into the gym with you, and it goes here - under the instructor's desk thingy - while you are here, that way it's safe and we both know where it is. Please do NOT leave them in the changing room! I burst out laughing and said Oh what a relief not to have to start explaining!
Cookie - and Lucy - or in fact anyone who is more than half hearted about exercise, there is a book called The Diabetic Athlete by Sheri R Colberg - which I understand is pretty damn good.