Well, it's not quite the phone that's a health aid, but a new service launched today called Wellphone, promises to help you keep your fitness quest on track when you're on the go.

Nothing to download, you just register at the Wellsphere Web site. Once registered, you can get text message reminders, daily tips, local health-related resources and log progress toward fitness goals from your mobile phone.

Wellsphere quotes a Stanford Prevention Center study that tracked a group of people's workout habits over eight weeks. The results? Those who received mobile reminders worked out for five hours per week on average, three hours more than the control group. But no real surprise there, we all know nagging  works -- except when it comes to my teenage son.

I poked around Wellsphere's Web site and saw they have quite a few resources including how-to videos and plenty of community entries. There's also an Enterprise Solutions area for companies that want to get their employees doing a few squat thrusts in between trips to the snack room.

"Wellthy employees make healthy companies" is their slogan -- interesting play on words. Here in Silicon Valley I think there are plenty of gym rats, but the overriding corporate philosophy is more like "healthy companies make wealthy employees". Perhaps the two aren't mutually exclusive.