Stretching the iliotibial band is a popular idea, but it’s very hard to do it right, and it’s probably not worth it.
IT Band Exercises, Knee Pain Treatment
IT Band Syndrome Injury in Runners: Stretches, Preventive Exercises, and Research-Backed Treatments - Runners Connect
What Is the IT Band? Yoga Poses for the IT Band
These IT band stretches are great for reducing hip and knee pain
Strength Exercises for Runner's Knee
The 5 Best IT Band Stretches
How To Fix IT Band Pain – Squat University
The 5 Best IT Band Stretches
Hip Stability Exercies for IT Band Syndrome and Runner's Knee