someone else wrote:
Ok question: How long is the optimal stride? How long can strides get before they become too long to be efficient?
It's obvious that they can't get longer forever, just like it's obvious that stride rate can't get faster forever. You can only move your legs so fast because humans have limits. To deny this is to say that humans are somehow not bound by the natural laws of the universe. How do you know they aren't as long and fast as they can be right now?
The point of doing the bounding work is to allow a longer stride to become more efficient. This takes a lot of work. Bounding is slightly inneficient, of course, but you don't race like that.
The human limits of stride length and rate are probably hundreds of years in the future. Can I remind you that this sport is very young?
Imagine back in the 1950's when the men's marathon record was slower than Paula Radcliffe's 2.15.25, people like you would have been saying that no woman will ever break 2.40?
The very idea of sub 2.30 would have been ludicrous.
This is the typical ignorance and insecurity of runners, thinking that the current World Records are close to the human limits. Paavo Nurmi thought that the human limit for the mile was 4.04
I'm glad that not all the best runners think like this. Sir Roger Bannister was asked on the 50th aniversary of his sub 4, what he thought the record would go down to, and he thought 3.30 was possible. Good for him I say.
A stride length of 2 meters in the Marathon combined with a high stride rate is a perfectly reasonable expectation, but the pace that would generate, is something that seems incredible.