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I did exactly the same. I had ITB issues on my right leg caused by a weak/inactive glute that caused instability when tired. So did a couple of months of strength and stability every other day whilst running regularly still but not hard and it solved the problem. Now just do band work 2x a week to maintain and I've had zero niggles for over a year and I've just finished the pretty tough elite 10k plan injury free.
I had bad ITB pain last year
Lots of single leg strength work focussed on calves, hammies and back.
So deadlifts
Squats (side, pistol, romanian)
Calf raises
Nordics
Stretching of hamstrings and hips
Proper warm ups (yeah right)
Lots of core work - deadbugs for days