Many of us haven't sprinted all-out for many years.  This is a shame.  There is a LOT of fitness and function in sprinting. 

All-out sprinting can be problematic, but it doesn't have to be.  We suggest taking some extra time to warm-up before this workout.  About 5 mins, or so, of running should suffice to get some blood flowing to the vital areas and warm-up.  

We also think it is a good idea to take the first couple of sprints at half-speed.  Then, a couple at 75%.  And THEN, try some full sprints. 

Pay close attention to your hamstrings and calves while sprinting.  If you start to feel undue tightness during the workout, back off the full speed stuff.  Even quit running altogether if you have to.