recommendations to support hip flexors please?

Currently doing stronglifts 5x5 and only a few weeks in, so on a very low weight but I have an old hip problem starting to reoccur. Last time it was linked to running and had me out of action for weeks and involved expensive physio to recover so I am wanting to avoid this this time.
My main problem is using the hip flexors instead of glutes and/or core so any recommendation for good exercises to get these firing up again and welcome.

Thanks

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