That is contrary to what CF was demonstrating at the seminar I attended. In fact he specifically had some of the athletes ‘do 50’ where they had to stand doing arm action only and ensure the angle remained at the top, at times he wold place his hand there to ensure they reached out far enough.
The arm at the front of person should be being held in 90deg angle, as you drive the arm downwards (not backwards) but downwards, even though you think you are keeping your arm at 90deg angle, the force of the downward drive forces an opening up of the 90deg. However, not like what is shown by G-force, thats excessive arm swing opening.
Also, from what i can see in the photo G-force, if you can raise you front arm a touch higher, as in, its only reaching shoulder height, it should reach eye height, you may or should find your lead leg will also raise that bit higher too, hopefully, raising your hip height at the same time?
As John says above, just expanding on it, the “arm 50’s” he mentions, your just standing there, and just the arms are moving in the right angles. Do this 50x in perfect form. start slow and work up speed as you get it right. If somebody knows what to look for, do it in front of them, otherwise, do it in front of a mirror.
And name one athlete that keeps 90 degrees through the entire swing. Ben didn’t, Monty didn’t, Mo doesn’t, even Asafa doesn’t. When rolling down the back straight in a 400, guys like MJ and Wariner don’t, but it opens up when they increase the effort or are running a 200. Go do a quick Google image search.
You may be taking the drill too literally, when it’s just supposed to simulate the feel of arm action during a race.
You try to hold the 90degree angle to get an elastic return. Greater forces at higher speeds cause it to open slightly (that’s why it’s easier to hold it in the 400 but less so in the 200 and 100 as the speed goes up) but the elastic return at the shoulder is maintained.
If you DELIBERATELY open up, you loose the elastic returm. You seem to know a hell of a lot about what Ben was trying to do and exactly how sprinters should do things.
I’ve got an idea. For once, why don’t you try it and see instead.
I believe what Charlie just said is in CFTS.
Francis Obikwelu…? 
I’m quite sure he holds that angle throughout…
Asafa Powell nearly maintains a 90.
In the race today kim gevaert had one hand closed inna fist and the other hand open.
asafa seems to have an angle of much less than 90 when his arm is at the end of its swing at the front.
Where did I say what Ben was trying to do Charlie? I just observed what he was doing. Which was his arm breaks significantly as it pases the hip.
My comments were in response to John’s comment regarding what should “ideally” be happening, where he was taking it literally that the arms shouldn’t break from 90 degrees at anytime. That’s why I said performing the arm drill is probably attempting to simulate what an athlete feels at speed, and i possibly should have added “even though it’s not staying at 90 while at speed”.
I think we’re both trying to say the same thing Charlie.
Sorry Jason. Not so. Just because it’s not open at the back doen’t mean, it hasn’t opened earlier.
Maybe I wasn’t clear in my explanation, the last part of that sentence was the arm may extend slightly but that is a result of the force applied by which I meant there should be no deliberate attempt to straighten it.
Certainly that was my clear understanding of it but will stand corrected if I am wrong.
You are exactly right. That is certainly what I have taught and what my athletes did. The arm breaks because of the forces involved. Also the down motion from the hands starts at the top.
Charlie, I know of one top coach who teaches breaking at the elbow. He believes, if that joint does not open up you retard stride length.
Pickering’s arms come accross the body a fair bit don’t they.
HAHA! He’s arm is worse than mine 
LOL…no one’s arm is as bad as yours Gerald! All u need is some cm and inch marks on your arm and it could be mistaken for a ruler…hahaha… 