Cheers Kickchick. I do agree with you that cardiovascular tolerance can be built up over time. The problem for me is keeping in a good enough condition to workout hard enough to improve it. Last autumn I was doing really well and for just about the first time ever I was starting to be able to go on the jogger at the gym for a reasonable amount of time and to go out a bit running(although slowly) on the roads. Then I went and broke a bone in my foot (bashing it on a bench in the changing rooms )and by the time it had recovered enough to start again I was back to square one. (Fortunately I didn't have to give up the karate completely at the time as I could walk in bare feet, it was wearing shoes that was very painful). I'm very prone to bronchitis in the winter too which always manages to knock my fitness back. One day I'll win hopefully. It's just that it's always two steps forward one step back - or vice versa. I'm off down the dojo tonight, and weather permitting I'll get a good walk in the Lake District tomorrow, so plug on...... Alison