Hip flexor tightness comes from sitting and poor posture, and that's why you need to stretch your hip flexors regularly to avoid back pain and injuries.
Hip Flexor Injury: Symptoms, Causes, Treatment, Prevention
3 best hip flexor stretches to release tight hips
8 Yoga-Based Hip Stretches to Relieve Tightness - Yoga Journal
8 Best Total Body Stretching Exercises to Improve Flexibility
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Dynamic Hip Flexor Stretch
7 Hip Mobility Exercises
Tight Hip Flexors: 12 Simple Exercises You Can Do Anywhere to Stretch Tight Hip Flexors and Relieve Hip Pain (Audible Audio Edition): Tom Parker, Jeff Moon, Tom Parker: : Books
I have very tight hip flexors in a specific area as highlighted yellow. : r/yoga
Hip Flexor Exercises to Strengthen and Stretch
8 Simple Exercises For Stronger Hips - BEGINNER and INTERMEDIATE
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The Best Static Stretches You Can Do