We run 15 minutes on the bottom story of our school, up 21 stairs across the top floor then down 21 stairs....it kinda sux, mostley cuz i run in my wrestling shoes...which have no support....I hate these weird things that we started doing yesterday...4 people and 4 45lbs weights, you have to use team work and hold them all up in a circle, your mostly holding on to them with your fingers because theres nothing to grip...they suck, we hold them there for 3 minutes then 2 then 1 then 30 seconds (45 isnt much, but its 2/5ths my weight the hardest part isholding on tobasically nothing while holding them up.)....i dont really mind runnings...i really enjoy sprints.... 6 inch leg lifts...now those SUCK!