I actually found their names a couple of days ago with some of their recorded exploits:
Brian - 6 recorded finishes
Brenda - 5 recorded finishes
Simon - 1 recorded finish
(I'm wondering if I missed someone?)
Sadly enough I didn't use the opportunity I had to speak with them about running. All I got was an ominous warning from Brian on the last day we met as a class that he will hold me to the fact that I said I will run a 5k race this year. Did I mention Brian is a lawyer.
Keeping a promise to those you respect is a great motivator!
(BTW I have about 90 days until the race!)