Hi Edie, The check-ins are just daily check-ins for like minded folk. Let's see, the Daily one is just a posting of whatever workout you have done that day, with a little chit chat. The Cheetah's are mostly runners (I think, correct me if I'm wrong.) Weight watchers are, well, member of Weight Watchers. Hardcore are what they say, as is the monthly rotation check in. The Haters hate cardio, but use the check in to push each other to do it anyway. They are kind of crazy. I post on a couple, as do others. You are welcome on any. Just kind of hang out and see which ones seem to suit your personality.