weight training legs if you run/bike a lot?

[Run in DC]

Just wondering what everyone's thoughts are on how much weight training you do if you also tend to run/bike/interval train a lot. I find that doing these other activities keeps my legs strong and muscular, and thus I have a reduced need to do weights for my legs as compared to doing upper body. I also hate doing a heavy leg day and being left sore when I'm about to do another run or bike ride. It seems that heavy leg weight training and running/biking don't mix well together. The only thing I would add is that at least in my case, I do not feel that my muscular development between my lower and upper body is disproportionate.

 

[Karky]

actually, running and other cardio like that cant be considered strenght training for the legs. because cardio is a light load on the legs over a long time. while strenght training requires a heavy load.