I think it's very possible to focus on more than one sport. I could see that if I added, say, basketball and volleyball to my workload that my off-season focus might be less...
But working football diligently for 6 months, with time for 2 or 3 baseball clinics thrown in, and then working baseball diligently for 6 months, with time for 2-3 football clinics, keeps me sharp, keeps me in shape, and to my mind INCREASES my focus.
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