One of the best ways to get your hips and trunk to move better is to have assistance. Either holding onto something or having a therapist add support, having some contact will localize a stretch and can increase the effectiveness. Using a stick or staff provides this cuing and contact giving you more for your effort.
40 Stretching Exercises For Your Whole Body
Best and Worst Exercises for Hip Flexor Pain
7 Essential Hip Flexor Stretches
10 Hip Stretches Your Body Needs Even More Than You Realize
30 Yoga Poses for Hip Opening - The Secret to Flexible Hips — Yoga Room Hawaii
The Best Hip Stretches - 10 Minute Basic Stretches for Tight Hips
Hip Strengthening Exercises: Benefits and How-To
22 Best Core Exercises to Build Strength & Stability
Hip Mobility Exercises 3 Hip Stretch Routines
15 Moves To Improve Your Hip Mobility
Physical Therapy Articles - Pain Treatment Tips
6 Exercises to strengthen lower back and core muscles
Basic stretches to combat the closed hip : r/flexibility
8 Hip Flexibility Stretches for Tight Hips