Holiday tips/presents

Hi Ladies!
For those of you who use a personal trainer, did you tip them or give them a holiday/christmas present?
I always give my super a card with cash, but that's the only person I've given a gift to.
I just realized that perhaps I committed a faux paus - I saw my trainer for the first time yesterday since before the holidays, and it never dawned on me to give her a gift -- I pay a lot of $ for her services.
Was I supposed to?
Should I give her something when I see her next week?
I'd love to hear your thoughts/opinions.
TIA!