Why have I never ever been able to walk uphill, without being breathless and now I m wheezing. I m 66 on beta blockers for SVT and overweight at 13 stone for 5 ft 5inches. But even as a not overweight 18 year old I could not run. I m very strong and fit otherwise, so in a gym 30 years ago, my overall fitness was deemed good, but the strength element compensated for arobic fitness. I ve had half an an acre to attend to, a large house, all ok, but in flat Suffolk, where I was born. I ve now moved to hilly Devon, and walking now worries me as I just can t keep up. Yes I m overweight, so I need to address that, but please say some people are just not built for running or walking uphill?