>> miami-dade corrections, the sixth largest jail system in the united states, is like a small overpopulated that never shuts down. the task of officially running these facilities can be daunting. meals, medications, rec time, visitations. it's a never-ending struggle to properly care for a population of thousands. with most of their time spent locked behind bars, inmates at miami-dade corrections welcome the three hours a week they're allowed outside for exercise. >> we come out to the yard, try to do some stretching. that way we don't have to worry about the officers with us when we're in there and everything. this is one of our privileges right here. basically everybody looks forward to coming to the yard. >> we come out here for a stretch then run, run a little bit, do a little jumping jacks, do a little pushups, you know, do a little shadow boxing. you know what i'm saying. try to get the lungs open. very important because we need that fresh air to open up our pores, you know what i'm saying to sweat, because we're on fined 24 hours a day. >> but while inmates enjoy their time spent in