Have had asthma and a chest infection since January - the cold weather is a pain for anyone who suffers asthma but this year has been the worst ever for me. I've been power walking for 3 years now with really good speeds achieved but took the C25 challenge up mid January as I needed to up my game a notch. Had got up to week 4 but have had to stop on Docs advice. Decided to go back to the beginning so had a go at week / run 1 today but had to stop 3/4 of the way through as breathing was really laboured. I feel a bit pee'd off but I know I can do it and when the warmer weather comes back (or should that say IF !) I will start over. In the meantime I will keep on with the walking and yoga. Any other asthma sufferers experiencing similar problems?