[header] How to train to become a navy seal [title] Determine your fitness level. [step] In order to start training for the rigors of bud/s and the navy you have to know where you're at physically. To do this, you can take a pst. 
The pst (physical screening test) is administered by the navy to see if you have what it takes physically to complete the training. You can take a mock pst at home.