The strongest guys always seem to have good sprints. So get strong and fast. Build your endurance and power. If you are not one of the best guys in a field of 70 then what good is a strong sprint?....unless you want to sprint for 20th. I think sprinting is important, but maybe a bit overemphasized for most. Alot of the physical qualities required for good sprinting come by default thru your consistent day to day training...such as long rides, fast club rides, racing, intervals, etc. Now when you become one of the fastest guys in your club and at the local/regional races, then yes you could start doing more dedicated sprint training. That's when the little things make a big difference. Being just 5% better could mean the difference between 1st and 5th.