I think if you are a professional athlete you should keep yourself in shape. However, if it doesn't affect play it's not that big of a deal. Some guys can do fine while overweight others can't. By Kevin's own words he's not as good when heavy so he needs to figure it out. I know one thing, my range of motion on every thing has increased a lot since losing 40 pounds and I am no doubt more flexible in the hips, waist and legs which would be important if I could pitch.