So you want to join the U.S. military and become a flat-bellied, steely-eyed killer of men (or mover of supplies, or photo-taker of soldiers, whatever). That means some trips to the recruiter and boot camp might be in your future. Here are six things to help prepare you for basic training:

1. Work on your physical fitness

Let’s get the most obvious thing out of the way first. You should exercise. A lot. Recruiters can tell you what exercises are most important for your branch and job school since they do differ. In general, future Marines and soldiers should concentrate on overall muscular strength and endurance. Soldiers can be lax about pull-ups but Marines should hit them hard.

Everyone, including sailors and airmen, should build up their endurance by running, biking, and strenuously hiking.