[matwood]

What kind of shoes did you have? What kind of surface did you run on? Did you get your stride checked? Did work up to any distance or go all out day 1?

Because running looks easy as opposed to say weight lifting, people often do it without thinking. Running is just like any other exercise in that you have to start slow and work up to more. You also have to do some research for proper technique and equipment.

[melling]

New Balance 990. I started with C25k but had to repeat many days. I'm quite out of jogging shape. I run on the sidewalk or road.

[matwood]

I would check on the shoes and then have a running store look at your stride. I used to hate running because in general it hurt. I tried a bunch of different shoes, settled on Brooks Ghosts, and running is actually a pleasure. I also focus on my stride and work on foot strike, length of stride, etc...

Since you're doing the C25K I'm assuming you are not super athletic to start. If you are overweight, you may want do some other cardio until you get your weight down a bit. If it hurts obviously don't do it and find some professional advice. Re-doing days in a training program is fine, everyone has their own pace.

Good luck!

[jfoutz]

If you go to a decent running store, they'll record you running on a treadmill. They should show you what your ankles are doing so you can pick shoes to support your feet. Most people aren't biomechanically sound, the ankles roll in or out a bit, this can be mitigated with shoes and inserts.

My ankles roll in a lot, with out a fair bit of support, my knees kill me.

Also, muscles recover quick but tendons take forever to heal - you're not running from a lion, so you can take your time and experiment with what works for you in a safe way. (it sounds like you are, so good for you)

[shepardrtc]

You probably need a different brand of shoes. For instance, New Balance works great for me, but I can't ever wear Nike or Avia. Both of those brands really hurt my feet, even though I run all the time. Keep trying different brands, or go to one of those fancy shoe places that can fit your feet properly.

[tormeh]

You probably know this, but soft surfaces are a lot better than hard ones, and be careful when running downhill.