Types are sprints, middle distance, distance, hurdles, and stepplechase.
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Soccer very popular there. And Athletics (like sprints or marathons)
There could be many different answers to this. The 3 categories I thought up were Distance, Mid-Distance, and Sprints. There could be other types though.
Disadvantagesod hollow sprints: Hollow sprints are very boring, performers may lose interest due to the repetition of the hollow sprint.
Around probably 3 runs if you do 2 sprints
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)