However, some sites, like Whisper, seem to go a bit further in what they track since they have considered targeted advertising for their users.
Most follow procedures similar to protocol used by message boards and forums, which permit a site to verify a user's identity if necessary.
And, with the growing number of class types, there's bound to be one to fit whatever mood you happen to be in.
Also, since instructors usually vary from session to session, even an "identical" class can seem unique depending on who's teaching.
For example, someone with a previous shoulder injury performs the same workout as another participant with an ankle injury.
Granted, good teachers are quick to provide progressions and regressions for individual cases, but it's often difficult to address each unique situation.The thought of pushing through a gut-wrenching workout on your own might not get you excited about hitting the weights—but killing it in an hour-long workout alongside 20–30 other people? Group fitness classes are known to be a great way to kick yourself into gear on those days when all you want to do is plant yourself on the couch.