I tried C25K several months ago and had to take a long break due to tendonitis in both Achilles. Now I'm starting over with new fitted shoes and a promise not to push myself too hard.

I'm also trying to figure out what proper running form is, to minimize injury. I thought I was following my high school gym teacher's advice before by landing I the balls of my feet before, but maybe I got it wrong. And I always admired some runner's long, graceful strides, but I've read recently that maybe it's best to take short, quick strides. Any advice, or reading/video recommendations?