do I need to train

Question
I've been running on and off since 1985.  I'm a 53 yr old woman. Since mid summer I have gotten back to more serious running.  I run just about every day, perhaps a day here and there for a break.  On average I run and hour a day at a slow pace about 6 miles.  So about 30 to 40 miles a week.  I would like to do a 5K.  I know it seem tiny compared to my average day run, but do I have to train for this??? I know I should be training for a marathon, but my toes seem to be the only thing stopping me.  I have constant toe problems, blisters, ingrown nails and of course the runner curse of the black toe nail.  I wear a good running shoe and alternate sneakers, nothing seems to work.  Also because of the winter in the Northeast I have been forced to run on a boring treadmill, could that be part of the problem?

Answer
Linda,

First, clearly you already run 5k a day so there is no reason to train for it if your goal is to finish. Secondly,
WHY should you be training for a marathon? Personally, I am not a fan of treadmills and would recommend running outside even in the winter. However, if you believe you need to run indoors than a treadmill should be ok.

Ryan