What are the benefits of running up hill instead of a flat level surface?

For example, Do you burn more calaries/fat?
Do you use more muscles?
Do you improve on endurance and speed alot faster?

Are there any benefits of running up hill instead of a flat level surface?

How much would my long distance running be affected?

yeah so im planning on running a 5k saturday and i havnt ran in 3 months about. How much do you think it has deteriorated? but i have been exercising by playin football and playing alot of intense basketball staying very actice?

Whats is the best thing to have for breakfast before a Triathlon or a race?

Should i eat a protein bar, or stick to only carbs, the night b4 (tonight) i am going to eat alot of pasta (should it be dry or with cheese?) but the morning of the race whats the best possible breakfast?