the current sprint speed is too slow and the player get exhausted really too quickly.
the current normal run should have the speed of the current sprint speed, and the sprint speed should be 25% faster than what it's now.
what i mean is that at any moment we got the feeling that the player is really sprinting.
when i say sprint I make reference to a real sprint, like if you would be running for your life. the player should have much more amplitude in his movement (arms and legs).
Arma 2 had a better sprint animations and the speed was slightly more important.