
"In Jay Dicharry's Running Rewired: 15 Workouts to Reinvent Your Run, America's leading endurance sports physical therapist and running coach lays out a program for runners to become stronger, faster, and more resistant to injury. Dicharry distills cutting-edge biomechanical research into simple workouts any runner can slot into their existing training program and begin seeing results in about three weeks. Through his work at REP Lab and top university sports clinics, Dicharry has found five essential skills for good running form. His Running Rewired will show how you can rewire your body-brain movement patterns to build these skills and transform your running within one season. Dicharry's rewire workouts will amplify any running training plan--from 5K to ultramarathon--to build the stability, strength, and speed you need. Just three, 20-minute rewire workouts per week will unlock performance you've never tapped before. Try Running Rewired to overcome injuries, break out of performance slumps, and renew your passion for racing."
Continue doing the walk / jog that you found "surprisingly enjoyable".
Continue doing jog instead of walk when that feels OK to you, and walk or stop whenever you feel like it.
Continue for a month.
Long enough to learn what your body feels like with that regular exercise. Learn to distinguish routine tiredness from something doesn't feel right. Let how your body feels be your guide.
Also, progress will be smoother if you also try to level-up with exercises designed to prepare for running.
The best approach I've come across is "Running Rewired" by Jay Dicharry. I was lucky enough to stumble across it in the local library.
https://www.google.com/books/edition/Running_Rewired/epZUDwA...
* Running Rewired, by Jay Dicharry: https://www.amazon.com/Running-Rewired-Reinvent-Stability-St...
* Anatomy for Runners, by Jay Dicharry: https://www.amazon.com/Anatomy-Runners-Unlocking-Potential-P...
* Run for your life, by Mark Cucuzzella: https://www.amazon.com/Run-Your-Life-Without-Well-Being/dp/1...
* Running Science, by Owen Anderson: https://www.amazon.com/Running-Science-Sport-Owen-Anderson/d...
The podcast "Science of Ultra" is also great and strongly rooted in a scientific approach to claims about running and training.
I started to feel some tightness in my left hip after running longer distances (25+ km), and went to PT. I basically now have a strong program of cross strength training that closely mimics the exercises in the Dicharry books, and I am know using muscles that were neglected before (glutes, mostly). I haven't felt any pain / tightness since.
While I don't have much of a background in sports, I do play bass and piano, and of course sit at a keyboard all day, which are also highly "injurious" activities. If something hurts or feels wrong, it is wrong, and you should address it. This is absolutely true for playing and typing, which should feel effortless at all times. I don't have enough experience with running to know how well that applies, since adaptation and training stimulus doesn't feel the most comfortable.
"Running Rewired: Reinvent Your Run for Stability, Strength, and Speed"