Thankyou for the replies.
I have read in some research articles, that producing too much air time is detrimental to fast sprinting, via being too springy & bouncy.
When Dwain Chambers added 50kg (110lbs) to his back squat, it did not improve his sprint times (as he mentioned himself).
Could he have been producing just too much vertical force (air time) when running, hence his times not improving?.
His increasing squat seemed to increase his vertical jumping abilities though…
Or is developing greater & greater air time the way forward?.