ok so i have a pretty good muscle base and now i want to begin training to give myself a good cardiovascular endurance. i plan on joining one of the military's special forces in the next two years after i get out of college and i want to be in the best overall shape possible. right now im 6'0 194 lbs and i estimate 10-12% bf. i need to get in better cardiovascular shape, however. i am fatt-ass slug but i know my running times and endurance now just wont cut it. do any of you have any suggestions to get my running/swimming endurance and speed up? thanks