When I thought I was going to Marine OCS I did Armstrong for about 8 weeks. I got to 15 on the third week and it took about four more to get the last 5. I wouldn't worry...keep on pressing on...
Why? Just for the sake of going faster? I just ask cause each pullup is worth almost a minute...
Because overall PFT score does not matter as much as being a strong runner and being able to keep up with your platoon at OCS. In fact, they flat out told us at our initial PFT that those of us who got good PFT scores by getting 100's on crunches and pullups would stick out like sore thumbs, and that they knew who we were and would be watching us to fall out on runs. At the time, I thought, "Don't listen, just push hard in the runs and you'll make it," but sure as sh!t, a few rough days later, with a couple of chits for falling out in runs and x-rays with black lines on them, I was packing for home.
Your legs and feet are your vehicles, you depend on them for everything. For example, on a fartlek, you can suck at one of those events and get by ok, probably. If you suck at running, you're screwed the whole way.
I guess I could have put it better by saying that cardio fitness, endurance, and having stong legs that will carry you and your gear wherever you need to go in a decent timeframe is more valuable than having good upper body strength for the PFT or whatnot.
Both are important, though, or they probably wouldn't test them both, right?
