Do any personal trainers get tips after sessions? If not, why since this is a service?

I don’t expect tips because it is my own business, and I don’t tip my massage therapist because it is her own business. But it is an interesting question as I would tip a massage therapist in a health club, but not expect one if I trained in one. But I think Karin answered it best by mentioning that we see clients 2-3 times a week versus once a month or more for a massage therapist or hair stylist.