well for one it is mute without the authors profession.. which i'm guessing is not medical. they also do not have a bibliography for the references which is unprofessional and makes it all crap.
watch any professional or good college team and you will see active warm ups, not static stretching. This involves jogging, light running, active stretching and then building up to faster speeds.
cycling i don't stretch before but i do use a smaller gear until my legs loosen up. i stretch and use The Stick afterwards to help with soreness.
backpacking, maybe even especially long distance, would benefit from some active stretching along the way during the day. then some light static stuff at night afterward. increased flexibility lengthens your stride length and you can hike faster. Will also help if you slip or need to take a bigger stride than normal and you extend more than normal.
I think it's funny they say cramping cannot be fixed by drinking water and sports drinks but then push Pickle juice.. which is just salt water.. which is what sport drinks are but with flavors and carbs. Gatorade has been researching that stuff for decades.. i'm guessing the Outside people have not.
the dehydration thing is BS and finding one study to disprove it is funny. Tour de france riders drink like 8-12+ bottles a day and when you are doing 120mi a day for 3 weeks in a row i'd say they have a better grasp than the article.
Ibuprophen thins your blood out a little bit (not as much as asprin) so folks with heart issues or at altitude should probably ask their dr before using it prior to stuff. also it is not great on your stomach so you need to have it with food.
hahha no surgery is better for ACL's haha I dare them to jump off a 24" box and then pivot with no ACL and see how their performance is after that. well.. if they can get up. not to mention the will have arthritis far sooner.