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I'm a relative beginner, but I've seen people saying that you have to be careful not to overstride when trying to run faster because you might injure yourself. That would seem to imply that you have to push harder on each footfall (so you travel further on each "in the air" phase) or increase the number of strides per minute.
Assuming the first is based on muscle strength and won't really increase unless you do hills or strength training of some other sort, is there a way to get faster by increasing the number of strides per minute? Is it possible to train this and if so, how?