I have massive respect for people who practice parkour. It takes a lot of time, discipline and willpower. If I was a guy, I would totally be all over it, but alas, I am not.
I have good agility and endurance, but it's hard for me, as a woman, to have the same upper body strength as most of these men do. I still like to work out on a regular basis, and do boxing and the like, but I can't do most of the things you guys do. It's pretty amazing!