Mine are pretty specific but:

1. I'm a bartender. I can get messages if the door person/security is having a problem customer while I am elbow deep in an ice well (plus phones are dirty so I'm not touching gross phone and then your lime wedge even if I am super religious about washing my hands with everything I touch behind bar.) I don't wear it all the time but it is a useful tool.

2. I monitor my heart rate cos I'm having health issues

Butttt.. I don't feel bad for these folks, mine came with my phone.

Have they just been using that stupid blue water from the commercials this whole time?!