How many people on here rarely get injured except for occasional PF and knee trouble?

Been running since 7th grade (now in NCAA, Fr.) and I've only been injured once to the extent where I had to stop running for 1-2 weeks. That was in 8th grade with hip pain (probably going through puberty/growth spurt?). Haven't had anything since. Occasionally I'll have some slight pain around my ankle or achilles but these are rare, random occurences that happen once every several months and simple icing makes the problem go away. I think I attribute this non-serious injury streak of 5yrs (ie my entire running career thus far) to running on soft surfaces (mostly grass and bridle trails) and slowly building up mileage. I've been at consistent 70-90mpw now for the past 2yrs and have improved times every single year I've run competitively (no stagnation). I don't think there's anything special about my stride or form. I do core everyday (planks, crunches, excercise ball, etc...) and lift 2-3 times/week. Basically I just go out everyday and run, if I feel pain I almost always run through it. Right now in my college town there are fewer soft surfaces and we run mostly on concrete during the season (I think this is true for 85% of collegiate runners). There's just no way getting around having to hit the pavement in a college city. I have noticed that my legs take more time to recover and sometimes feel flat more so than when I am at home. I guess it's part luck and part doing all the "right" things not to get injured. Just my n=1.

Started running young (summer before 7th grade) and was always building mileage in middle and high school. Started at 20 mpw as a 7th grader (coach kept records, still has them, cool guy) to 30-40-50-60-70 the next five years. Attended running camp twice a year every year starting freshman year, where I got cliniced on running training, nutrition, form, etc. Jack Daniels was the keynote speaker at every camp, and sat down with us in small groups later in the week and went over video of our running form frame by frame, showing us where we could make changes. By the 2nd camp of my junior year of HS, he had almost no comments. Ran in a clunky trail shoe that was 2 sizes too big, bought at Dicks Sporting Goods until senior year, when I started going to a running store, where I was fitted for a neutral shoe (moderate arches, but I strike neutrally). Ran 4 years on the back end of a mid-tier D1 school, where I had ups and downs. Graduated a year and a half ago, still running, but real training is on-again off-again now that I'm working, going to school, and doing research. HS and college kids pay attention; you've got more time now than you can possibly realize.

Only ever hurt twice; once junior year of HS when I stepped in a pothole on a training run which was also icy, and tweaked my IT band. Took two weeks off, spent two weeks on the elliptical, two weeks alternating days of elliptical and running, then back to normal running. Never had an IT issue since.

Other time was when I broke my toe junior year of college playing soccer on the beach.

Starting summer before freshman year of college, started going minimal, with a neutral shoe at 10ish ounces. Went back and forth between that and some heavier stuff, then mixed 10s with 9s, then 10s with marathon flats, then flats with 9s. I don't really use the super light flats for anything but workouts any more, but my heaviest training shoes are under 9 ounces.

rarely injured, but when I am its my hamstrings, not knees or pf

Your question implies that PF and knee problems are are par for the course for runners. I don't think so.

You describe yourself as "rarely injured." How old are you? Unless you are at least in your 30s, it's too early to say whether you are doing something right or just benefiting from your body's youthful resilience.