If you’ve ever had problems with your knee, hip, lower back, calf or achilles, chances are you have some unresolved tightness in your TFL.
As you can see, the ITB has upper attachments to both the gluteals and the TFL. Any dysfucntion/weakness in the glutes means that the TFL needs to work proportionally harder. Gluteal inhibition is common - especially if you spend a lot of time sitting.