you got to do something. you got to take care of your body before it can take care of you, you know. >> every shackle has two locks on it. one lock, and two locks. all the 1s are keyed the same and all the 2s are keyed the same. so you have to have two sets of keys for each shackle. it's security. in case inmates get ahold of one of our key chains, it's more than likely they're not going to get ahold of two. >> go to secure the chains so the lock won't go up and down on your foot all day long. the most comfortable place for you to walk, or you're going to trip on them all day long. you have to secure them. with the shoestring. >> get your bags two at a time starting up front. ♪ >> at age 50, mchellon is one of the oldest inmates to work in the fields. his 20-year-old cell mate scott parker is one of the youngest.