atkins diet works wonders if u want a fast way...

Slow way is excersizing alot alot alot... my daily rutine...

Sprint for a mile. (ususally i do it 4 times around my block)
rest 20 second/get water
Sprint to closest gym (for me thats like 1.5 miles away) =P
get changed to gym clothes
pump weights for 30 minutes
every set get a drink of water
go to swimming for 30 minutes. (around 100 laps)
get out of water and change
sprint home.
drop dead on floor and sleep =D

(all that usually takes 2 hrs to complete