I'm friends with a lot of fit couples, and I've noticed that, while they all enjoy working out and have memberships to the same gym, they rarely follow the same fitness routines. They might jump on the elliptical together, or spot each other on weights occasionally, but more often than not, they do their own thing.

As long as they're both happy with their individual routines, generally, it works. However, what if your sweetie is far more dedicated than you are, or vice versa? For example, Spice Girl Geri Halliwell has recently been kicking butt in the fitness department, and she's looking fantastic. However, her dancer boyfriend, Ivan Velez, is reportedly getting fed up with the amount of time she spends working out, and isn't a fan of being roped into her early morning fitness routines.

It's not easy -- if he's naturally thin and you put on weight easily, you might feel compelled to hit the gym hard every day, and he might be perfectly happy going two or three times a week. If you really want to work out together, That's Fit posted some suggestions last year for involving your sweetie, but one thing I would suggest is that you be flexible and figure out whether it's more important to you to have a long, hard workout, or to work out with your partner. If you're willing to take a brisk, two-mile walk instead of a four-mile run, he or she might be more likely to join you. Or, if there's something your sweetie enjoys, give it a shot -- there are plenty of ways to burn calories, after all!