Disadvantagesod hollow sprints: Hollow sprints are very boring, performers may lose interest due to the repetition of the hollow sprint.
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Yes it is. Running sprints helps you with power when you start so that you have more explosiveness when you run.
You sprint for 100m. and see what time you get. Track sprints (aka wind sprints) are used by runners for building endurance and response times, in the hopes of shaving a few precious fractions of a second off their competitive finishes.
Yes, the lactic energy system is used for the fast short sprints.
Running (sprints)
what is sprint's adress
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A cheetah.
http://en.wikipedia.org/wiki/Sprint_Nextel
Hurdlers