PFA = Physical Fitness Assessment An eliptical machine will now be an option for the Navy's PFA. Along with the 1.5 mile run, 500 yard swin and soon to be stationary bike. The catch is your score isn't based on TIME but CALORIES BURNED in 12 MINUTES. So I gave it a try. I burned up my legs for 12 minutes, going between level 15 and 19 and sweated out 220 calories. The actual scoresheet for it hasn't been released yet so I'm not certain how good or bad I did. All I know it was rather difficult, (I had my weight vest on).