I know endurance is something can improve with enough exercise. I also know endurance is something you have to maintain with exercise. I hate that! I just took up running again. I have not ran since the middle of June which is when I did 70km for two weeks in a row. That, combined with two Sunday afternoons playing tennis, screwed up my knees (which I know, is not surprising ).

I tried various times to start exercising again, but each and every time, my left knee starting hurting again. I didn’t try anymore since the beginning of October and that was more because I was constantly on the road and didn’t bring my running shoes with me all the time. I compensate a little with kite boarding (which, to my surprise, does not make my knees hurt at all).

Anyway, tonight I did a 5k run and that’s when it showed. About two-thirds of the way I was already completely exhausted. It’s good I didn’t bring my HRM, because I ignored everything and kept on running, trying to finish the 5k in under 25 minutes. I didn’t succeed: 25m05. Oh well, it wasn’t that bad. But it seems I have to start doing a lot of exercise again before I’m back to my 21 minute time (that’s outside, inside it was better).