Originally Posted by DannoXYZ

That's not really a sprint-exercise; it's intervals for building muscle-strength. It does help build strength to use one higher gear for 1-min intervals. However, I find for the time-spent, it's much more efficient and quicker to just go to the gym and do squats, leg-lifts and calf-raises. There is only only so much strength you can build up before you gain too much weight that cancels out the increased strength. So you need to address both. One is to maximize muscle contraction-force through strength-building exercises. Then you also have to work on sprint technique to develop as much power as possible from the strength that you do have.