I typically run four to five 5K's and at least one 10K each summer, and I run 2.5 - 4 miles every morning, June through mid-August. I'd really like to try my first half marathon this summer, in late July or early August. I also need to really tone-up my arms and shoulders. If I work diligently on both (training for a half, and "building" upper body muscle) at the same time, can I achieve success for both, or do I risk sacrificing potential quality in one or the other?
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