It really depends. If you eat enough, and maintain intensity in the weight room, in terms of weight on the bar, then you should be okay.
The energy balance equation holds true. If you eat enough to maintain weight, and keep to a low-ish volume, high intensity weight training plan, you should be able to spare any loss of muscle.
It is true though that marathon running, and the training that goes into it, does not really coincide with above average muscularity. Unless you're talking about Dean Karnazes or one of the other ultra runners. It seems like distance running is hindered by increased muscle mass to a point, then once you get into crazy stuff, increased muscle seems to help. Within reason of course.
What are some of your stats and numbers right now?
And if you don't think kettleball squat cleans are difficult, I say, step up to the med-ball
- CJ Kim