Without a doubt the most common complaint I hear from athletes is that they have hip flexor mobility issues. Most of the time they've spent months stretching and foam rolling with no effect.
Strengthen Your Hip Flexors With These 10 Exercises
The 9 Best Butt Exercises for Tight Hips
9 IT Band Stretches for Relief, According to Physical Therapists
How to Really Fix Tight Hip Flexors - T Nation Content - COMMUNITY - T NATION
Rausch Physical Therapy & Sports Performance
Your Don't Have Tight Hip Flexors - A better fix - The Barbell Physio
Why Your Hip Flexors Are So Tight (and What to Do About It) - Legion Athletics
Why You Have Hip Pain—and How to Treat It
The 8 Best Drills To Unlock Your Hip Mobility - The Barbell Physio
The Best Mobility Exercises for Shoulders, Hips, and More