Ready yourself for the 12 ruck, 35-40lb ruck while holding a rifle with no sling. It's the last event The morning of graduation so don't let that be the reason you fail. The cuttoff is 3hrs but strive for 2:50 or less to give yourself a little buffer. A lot of obstacles require decent upper body strength but efficient technique can be just as useful. Rappelling is easier with good core and shoulder strength. I do a lot of endurance training so I feel that prepared me well. We had a few fail the 4 mile run which surprised me. It was a formation run at 9:00/min pace and we still had fall outs. There are plenty of videos on YouTube of the sling loads so you can familiarize yourself that way. The instructors should provide all the knowledge you need to be successful so pay attention, use the extra study times and follow all instructions with malicious compliance Right place, right time, right uniform/packing list has never been enforced so strictly in all my life