Losing weight

Hi Bjorn, I already asked this question before, but you must have missed it :) See the topic "anorexia is good for climbing" (title is a joke of course). I am very heavy for my height because of being overly muscular especially in my lower body. I am trying (with succes) to lose weight for climbing. From your presentation, I see that you have been trying the same thing, so I was wondering if you have any advice on how to lose local muscle mass in the legs. I already run 3 to 4 times a week, 5 to 10kms at a slow pace and of course I'm still climbing. I've been steadily dropping weight for almost two months now, went down from 76 to 71. I aim for a 500 kcal deficit per day, which results in a weight loss of about 0.5kg per week. I feel fine, fitter then before even :) My fat % is getting very low now, so the time for muscle loss has come. So again, any advice? :) Best, Armand