We’re all professionals in this “techy” world be it a notepad, cellphone, ipad, clipboard, etc. Unless you had a strict “no cell phones/texting” policy then address it in private without the “parents glance” members are watching you as well and you just addressed it in public.
I carry mine with me for various reasons as well as other trainers and some carry ipads using apps. or programs. Clients and Health Clubs hire us for our talent, skills and results and I see no harm in using an electronic device.
Give your trainers respect with adult professionalism.
Did he give his reasons for texting?