I'm a runner who is relatively new to resistance training. I'm 38 years old, looking to get a build less like an Ethiopian marathoner and more like an American sprinter. I'm wondering if I need to eliminate, or cut down my cardio? I usually lift for 30 minutes 4 times per week, and run about 15 miles per week.
Since I want to add muscle, not fat, I think the running is good. But, does the running consume too many calories and prevent muscle gain?
Since I want to add muscle, not fat, I think the running is good. But, does the running consume too many calories and prevent muscle gain?

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