Personal Trainer for elderly mother

Hey ya'll! I'm a Houstonian living in NY and need some help for my mother-in-law. She is old and has mobility issues. She has trouble with stairs or even walking onto a sidewalk with a curb.

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Does anyone know of a personal trainer who specializes in helping older clients with mobility, stability, strength and stamina? She does Sit and Be Fit now, but I think she needs someone to take into account her specific issues and create a routine for her specifically. She is in the Cypress area.

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Many thanks in advance!!