We are not supposed to stretch "cold" muscles.

https://www.mayoclinic.org/healthy-l...g/art-20047931

There are several tips in the article linked above, but this one, in particular, applies here:

Use these tips to keep stretching safe:

Don't consider stretching a warmup. You may hurt yourself if you stretch cold muscles. Before stretching, warm up with light walking, jogging or biking at low intensity for five to 10 minutes. Even better, stretch after your workout when your muscles are warm.

Consider skipping stretching before an intense activity, such as sprinting or track and field activities. Some research suggests that pre-event stretching may actually decrease performance. Research has also shown that stretching immediately before an event weakens hamstring strength.

Instead of static stretching, try performing a "dynamic warmup." A dynamic warm-up involves performing movements similar to those in your sport or physical activity at a low level, then gradually increasing the speed and intensity as you warm up.


Also:
https://wwws.fitnessrepublic.com/fit...-debunked.html

https://www.theatlantic.com/health/a...rrated/376089/

https://www.painscience.com/articles/stretching.php