Running style

I'm at work right now so I can't view the video (yes, I know it's Sunday...grr). But, dude, why you changing your running form?? I can, however, appreciate trying not to land out in front of you, though. It's the footstrike I'm wondering most about.

the reality is that to do some sort of runing analysis you need different shots (side, front and back) and you also need to run at different speeds (jog, steady, threshold) to be able to give proper feedback. but from the video you look comfortable which is a big thing.

ETA . the only wway to evaluate your foot-strike, you need high speed camera and anaylize it frame by frame. The majority of runners are hill strike runners including the elites. I agre with Lauren, focusing to land in front of your hips is important, changing your stride, not so much.

I can't tell much from the video, I think you need to be able to feel where the main force is on your foot when it strikes. Pictures can be misleading ... i wonder if we really run the same on a treadmill as outside also. You might want to try a little barefoot running on some level grassy surface to help get a better feel for fore/mid foot running style.

Why on earth would you want to shorten your stride length?  It's one of the primary determinants of speed.

Center of gravity should be OVER the foot, not in front.  Drop a plumb line from your ear, it should line up with about the middle of your foot.

If you want to work on stride mechanics, go run hills.  Bound up, focusing on stride length, and run down with a high turnover.

 Hill guide

I'm sure you know the answer to this question.  Obviously I don't know whether OP should shorten his stride, but there is such a thing as overstriding, which often leads to excessive heel striking.

x2 

Yes, this works, in my experience.  Also just running fast on a flat works, as many people's mechanics improve when they run faster.  Some people are also helped by running barefoot a bit.

My thoughts exactly. I'm a firm believer in the fact that there are some minor mechanical tweaks that everyone should make, but that, for the most part, you should work with the natural form that you have. I feel that you rarely ever should manipulate your stride length to match what you perceive to be optimal. Your body will more often operate at what is an optimal length for you (including naturally shortening the stride up hills and increasing it down hills).

 You have obviously had good success with your natural stride length, and it may take too much time and energy to alter your length and make your body adjust to a stride that it is not accustomed to. I would focus more on cutting out the heel-striking and then work on making your body operate as efficiently as possible based upon your current mechanics (which seem to be rock solid, stride length included). I have a naturally long stride. Even back in my heyday (sub 15:30 5k, sub 4:25 mile) I had a long stride that worked well.

I guess I live by the old adage "shake what your momma gave you." Sage advice by the Black Eyed Peas.

Like Jess, when I switched from heel striker to mid foot striker I lost 3-4 months with different injuries...PF and then achillies issues. Be careful as I think the older you are the harder it is on your body to make changes. About 6 months after I struggled with this issue I read an article that warned older folks about changing running styles in the exact way I did....that often injuries occured.