If you use a spacing of 1.4m to marking/stick for 3 spacings and really ‘attack’(accel)
to reach/extend for each spacing, once you come out of the third spacing and begin letting your natural flow and frequency of your ‘personal limb ratio makeup’ come into play by relaxing, its pretty much a given that you’ll get to 10 m mark in 8 strides…i too used this for myself to achieve 10m, 20m, 30m personal bests…at first i felt like it was too long and that i was overstriding, but i
reassured myself it wasnt overstriding since i was maintaining 4 strides a second off the start, flowing into 4.5 strides a second starting at around steps 7-8.
In the video below d.miller has lashawn merritt establishing stride length and speed/rhythmn coming out of the first 10m…however, given his elite status, he has him getting to 10m in approximately 6.8 steps(right on par with longest 100m elite striders-bolt, powell, lemaitre, gatlin)
The more i analyze videos of 100m the more i realize its pretty easy for elite male sprinters to hit 10m in 7 steps(give or take so much centimeters)…alot of the decathletes do it…
Decathletes 100m- www.youtube.com/watch?v=5L2eC2Sofhk
Heat 1- 10.91…7 strides at 10m
Heat 2- 10.89…7 strides at 10m
Heat 3- eaton 10.3x, hardee, the canadian…all 7 strides at 10m
Heat 4- 10.71…about 7.3 strides at 10m
Eaton training vid: www.youtube.com/watch?v=JqoqleB7Giw
At 0:40 seconds eaton is getting to 10m in 6.5 steps, which is very similar to merritt(albeit with merritt on the bend