The worst injuries occur in the most embarrassing places. Stretch the naughty bits. Yep, it's nasty. Most women laugh nervously when swiveling their hips to loosen the joints or try not to think about how fat their thighs look in the mirror when bracing their knee for lower back and hip-flexor stretches. Men usually pump up and look cool about their routine, admiring more than muscle in their splayed-leg reflections.
Power lies in the body.
Danger lies in the double-stitched gi. What the gi lacks in individuality it makes up for in a slightly more generous wingspan in the sleeves and pantlegs, making a very impressive snapping noise when a punch is well-timed and a even more impressive snapping noise when a small flange snags a seam. I practiced a downward block as part of my kata and snapped my pinky with a satisfying crack. Trust your partner only as far as you can throw them. This, in the martial arts, can be taken literally.