Very short strides, high knees (slightly higher than normal)
running very slowly, but with a very fast turnover, 170-190 strides per minute.
The Ethiopian squad use this technique whenever the ground is rutted or uneven or when running through long grass, i.e. whenever it is too dangerous to run quickly.
They also use it for recovery. You can run for many miles at a slow to medium pace doing a fast turnover with slightly high knees. You can cover any distance. My longest was 31 miles in 4 1/2 hours. A week later I ran my best ever race.
Last Tuesday I did 13 hilly miles at 8 min mile pace doing 170-180 strides per minute all the way. Next day I did 13 miles including a 2000 metre time trial on a hilly grass circuit and beat my PR by 14 seconds.
The Kenyan squad do a separate specific drill each day lasting 25 minutes at little more than walking pace, with high knees and a quick turnover.
The point of these techniques is to get used to moving your legs very quickly, that is what the best runners in the World do to win races and run incredible times. Check out some videos and you will see what I mean.
Geb and Bekele also concentrate on having a powerful stride as well as a very quick turnover