According to recent studies, working out in a group makes you happier than working out on your own does, and it's not just a state of mind -- your endorphin levels actually rise in a group exercise setting. If you're anything like me, this is big news because let's face it -- I'll do pretty much anything to make the workout less painful.

But not everyone enjoys social sweat sessions -- some prefer to hit the running trail with only an iPod for companionship. Yet others can't live without it -- they need other people around to motivate them to keep going. So I'm wondering, which are you?

Last week, I asked you if liquid calories were a big part of your diet. Want to know the results?

• 49 percent of you said nu-uh, no way. You stick to no or low-cal drinks only. It's just not worth it.
• 41 percent said not really. You indulge sometimes, but it's rare.
• 5 percent often do -- you like to treat yourself.
• 5 percent said you do all the time -- drinks are what keep you going!

Speaking of drinks, can you guess how many calories comes in a can of Red Bull?