Sprinting is an all out effort with nearly at the abandon of any form of control(you want to stay in control but right on the edge).
ALthough I simulate it on a spin bike when the snow and ice makes sprinting unsafe it does not approach the intensity of propelling your body through space to maximum speed and holding that speed until you slow down due to loss of capacity(80 to 100 yards and my velocity begins to ebb not due to effort.) Doing 6-8 of these sprints taxes my entire body. The bike sprints and burpees, can be taxing, they can really work the heart, but they are not the same intensity as " Running sprints"
I don't mind though. I am using the spin bike sprints to "rest" for a few weeks or couple of months, and if the green fields clear of snow and time be clear on a sprint day I may jump outside.
Maybe I will try pool sprints, That' at least is moving your body through space for speed, but it is hard to simulate the tesnion and explosion that running sprints give your entire body.
Integrity is what we do when nobody's watching.