here's more re feet swelling whilst running
["I got some really bad blisters on my toes, plus one toenail turned black after my last long run. What can I do to avoid this in the marathon and in the future?
When we run, our feet swell, sometimes as much as a full shoe size. This is more a problem with beginners than experienced runners, since often their fluid-pumping systems are not fully developed. The longer we run in any one workout, the more the feet can swell. (This also is a problem with the hands of beginning runners.)
When feet swell, this forces the toes into the front of the toebox with unpleasant results. Proper shoe selection is the best preventative. Your running shoe size may not be the same as your street shoe size. But if you choose too large shoes, your feet may slide in the shoes causing more woes. As you continue as a runner, this should be less a problem."](http://www.active.com/articles/marathon-faq-with-hal-higdon-part-2)
here's more re feet swelling whilst running
["I got some really bad blisters on my toes, plus one toenail turned black after my last long run. What can I do to avoid this in the marathon and in the future?
When we run, our feet swell, sometimes as much as a full shoe size. This is more a problem with beginners than experienced runners, since often their fluid-pumping systems are not fully developed. The longer we run in any one workout, the more the feet can swell. (This also is a problem with the hands of beginning runners.)
When feet swell, this forces the toes into the front of the toebox with unpleasant results. Proper shoe selection is the best preventative. Your running shoe size may not be the same as your street shoe size. But if you choose too large shoes, your feet may slide in the shoes causing more woes. As you continue as a runner, this should be less a problem."](http://www.active.com/articles/marathon-faq-with-hal-higdon-part-2)