tht gives me a question to ask u charlie…do u believe tht speed of humans will reach a plateau…i mean is ther a limit to humans capabilities…
I believe that Maurice Greene was the closest to running that time at one point in his life or another. If Maurice greene ever had the chance to run with that 2.0 wind and 0.10 reaction time that Tim USED, to break the world record he would have done something special. I’m sure that it would’ve been 9.6 something. Specially if he had the chance to do it while he was at his very best form. We can check the old world record and remove some of the reaction until its 0.10. And try to get an educated guess about the added wind speed of 2.0 and see what you get? I guess that would be a real world record and not Tim’s world record. I’m not sure if M.G can get back into that form again. May he do that and fix that ERROR in the world record.
Difficult to say that Mo was able to run 9.6 with +2.0m/s wind. Wind calculator/conversions are not that simple. My observations on wind assistance related with total number of steps during 100m have convinced me that wind has more effects on stride length than on stride frequency.
Just 2 typical examples for athletes with 3 performances done during 1 month in August 2000:
Marion Jones
Wind / Perf / SL / SF
+2.2 / 10.68 / 2.07 / 4.52
+0.1 / 10.78 / 2.05 / 4.52
-1.2 / 10.83 / 2.04 / 4.53
Christine Arron
Wind / Perf / SL / SF
+3.4 / 10.89 / 2.22 / 4.14
-0.3 / 11.05 / 2.19 / 4.14
-1.8 / 11.32 / 2.14 / 4.13
So wind has effects on stride mechanics, especially stride length, so is Mo able to support these changes due to wind assistance in order to run 9.6? I remember an article by Pat Connolly stating that Ashford nearly fell down in May 1984 when she ran 10.78 because of the great wind assistance, and because she wasn’t ready to hit this kind of speed so early in the season. The year before, at the USA-GDR match, she missed to fall too with a strong head wind. When you’re not strong enough or early in the season, wind can cause damage tht wind conversions can’t measure. Whe you’re perfectly fit and you find (by chance?) the right tempo/mechanics in accordance to wind assistance, you can do miracles (cf Griffith-Joyner and her 10.49W in Indy or Arron and her 10.73 w+2.0 in Budapest). Mo and Jones never really took benefits of wind assistance in their career, and they had the occasion, like Jones at USA Nationals in 1998.
i dont believe tht wind affects the stride length rather than the frequency…doesnt towing affects the freqeuncy nt the stride lenght?? ur theory shall only be true if ur leg falls infront ur center of mass
I don’t have theories, i just collect data and see what’s happens.
Wind assistance and towing are not similar in the way they affect sprinting. Towing pulls you through the air. The wind does not help in pushing you down the track.
I disagree with The ONE. Both the wind and towing devices affect sprinting in the same way, by increasing the NET positive force in the direction of movement. Towing devices apply a force to the centre of mass (if it is rigged properly) in the direction of movement. Wind, even if it is traveling at a slower velocity than the sprinter and therefore not “pushing”, stillreduces resistance in the direction of movement. Both these effects occur at all points during the stride, both airborne and contact phase.
Although towing “pulls” the body, it does the same thing as wind, which is to increase the net positive force.
what are the primary muscles in sprinting?
I’m guesing
- Glute exterior and interior, including the groins, inner and outer
- Hamstring
- Calf
- Lower abs for extending the legs
I didnt say quad because it comes with a good glute.
And I didnt say lower back because it come with working the hamies in reverse hypers and other stuff.
I also didnt say any other core muscle because I think the lower ab covers it all.
Is this correct? 
Primarily Hips, Glutes, and Quads during acceleration and Hams at top speed
Let me put it nicely before you get put in front of a firing squad! Take the time and perform a THOROUGH search of the archives. All your questions, and some, will be answered.
i am preaching this to everybody, bc i m a gib fan of him, especially a fan of his performances.
BUT: no schoulda,woulda, coulda makes WRs 
Some techincal problem with my english 
What do you mean with “landing foot over support leg’s knee” ? That the recovery feet should be as high (under the butt)as possible?
Also i can’t undestand properly “towing on he ground”.
Finally,“track is burning” is for trying to maintain short ground contacts (expecially where the stride lenght has still increased)?
Thanks for your contribute pj.
I’m not Seagrave, but form what i understand, the foot should be higher than support knee.
Towing can be described as the action of the foot on the ground like the foot is moving backward on the shoe.
Yes, short contact!
Thanks Pj.
What do you think about these tips?
I mean, thinking about letting the recover foot to pass over the support knee wouldn’t be a little difficult when running fast?What is this suppoed to build? The cycling motion without overstriding( feet under the Com)?
Don’t you think thinking at up&down (high knee) would be easier?
Yes i know that is Seagrave’s think,but i appreciate your opinion about.
You just want a short lever don’t you to minimise hip flexor work? As for passing over the support knee. Isn’t that in CFTS?
yes right,less moment of inertia (the dancer with extended or not arms).
I found that thinking about(high recovery feet) that in drills can help the fluidity of cycling.
But,i don’t know how n athlete would be able to thin about this thing when running.
Chambers ran the fourty in 4.17 at the NFL-Europe Combine.
Wow! Got a link for official results?
Has he finshed with Track definietly?
oh, i thought it was gonna be faster.