Hiya. I started to do more cardio in the gym a few months back (with the nod from my friendly GP). I've built it up really slowly and although i'm no athlete I'm getting better. The thing is I get through a lot of ventolin to achieve this and on bad days I can't move around the house much at all let alone get down the gym.
So I'm wondering does anyone know if there is any evidence to suggest the more you work your lungs out with cardio exercise the fitter they become?