Construction laborer keeps you fit. lol. I've been working construction since I was a kid. Laborers don't look lean because of the work, they look lean because half of them are addicted to meth. By the time they are 40 they are usually dead or disabled from too much speed fueled labor.

What is the pay schedule for messengers anyway? A few bucks for each drop off/pick up? Hourly wage? How many hours a day are people working for 21,000? It must be one of those "I do it because I love it" jobs. Plus, messengers probably like the street cred it buys them.