Elitetrack: Sport Training & Conditioning

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ok I'm trying to increase turn over with out shortening my stride to much. How would i go about doing that?

Don't worry about increasing turnover so much.  It doesn't play as important a role in top-speed as stride length does. 

However, if it is a big issue, stick drills, bleachers and things of that nature can help (but don't do too much of them).

400Stud, that is not necessarliy true. It depends on the level of development that he is at. If he is at the higher end then it is likely that he has reach the limit of his stride length and improvement in times results from increased frequency(as coach Francis has stated in his books). Top speed is a balance of stride length and frequency, it's not necessarliy dominated by one or the other.

http://desert.jsd.claremont.edu/~newt/track/splits/Seoul.html

Here is a link to the full analysis of the 88 Olympic 100m final for reference. The stride length of all sprinters gets progressively longer throughout the 100m sprint(well, except Desai who gets extremely tight, just look at the speed decline after 60m). Also the stride frequency of all the sprinters peaks between the 30-60m mark, the segment where top speed is reached.

I have to say, Speed is one's stride frequency+Sride Length+Strength/power. So if you have a quick turnover…and a long stride length you'll be that much faster! For turnover, I suggest an agility ladder. It will help with your foot quickness. For stride length…work on flexibility. The more flexible you are…the longer the strides are that you can take.