Do people really still stretch on cold muscles before exercising? Hopefully they're at least dynamic stretches.
I have a friend who was an olympian back in the 90s, still does cold static stretches before skiing. Old habits die hard, even when they're terrible for your body.
Funny thing about that concept...... The study that kicked off the "Don't Stretch Cold!!" notion looked at elite 5k runners. The group split in half, the first batch (control group) did a 5k on a treadmill & ran some silly time of ~ 15 minute IIRC. The test group stretched for 16 minutes & then ran the same 5k on the treadmill.
Now, I don't know anyone who can stretch for 16 minutes, but after they did the test group ran a
statistically slower pace of only 3% less.
So, none of us are elite 5k runners & I'm willing to give 3% of whatever that is to take my body into ranges it may encounter. The test group also doubled their exercise time w/ stretching. So. I'll use stretching and mobility work to increase a persons overall activity.
How I warm up is a daily (twice if I can) set of full body joint circles with some tension. These are referred to as Controlled Articular Rotations. I do this to take my muscles thru full range & spread the body's WD40 - synovial fluid across as much of my joint surfaces as possible. Typically, I will take a slow run first & do this on the top of the hill. I like to think of the joints in gravity sports as a mountain bike suspension fork - a couple slow hits overcomes any initial stiction and gives you more suspension. If / when a "hot spot" or sticking point is found, I spend more time on it prior to my run. Most ppl will learn their habitual hot spots. YMMV.