Don't do drugs and don't have any tattoos. Also you need to be able to pass a simple test.

Basically good overall conditon and talk to a recruiter and sign up. The basic physical capabillity minimum is three pull ups, 54 crunches in two minutes, and a three mile run in under 28 minutes. the other requirement is to take the ASVAB test not only will it tell them if you smart enough but also the high your score the greater your job options will be.