8 Surprising Ways to Burn 50 Calories (courtesy of AARP Bulletin)

Work Out Your Funny Bone - 10-15 minutes. 
Laughing out loud can boost your metabolism by 20%, researchers at Vanderbilt University Medical Center in Nashville, Tenn., found.  Laughing also increases blood flow and may reduce the risk of heart disease, according to a study by doctors at the University of Maryland.

Pick Up Litter - 8 minutes.
Walking is good exercise, but some bending, stretching and lifting make it even better.  Cleaning up trash and collecting recyclables (cans, bottles, etc. ranks way up there in the feel good department and sets a terrific example for others.

Rub Someone the Right Way - 8-9 minutes.
When it comes to massages as a calorie-burning activity, it's definitely better to give than to receive.  Massage, researches have found, reduces pain and stress throughout the body.  It may also lower blood pressure and boost immunity.  But that's only if your massage partner returns the favor.

Hoop It Up: - 8 minutes. 
Hooping - the exercise-oriented incarnation of the 1950's Hula-Hoop craze--gives you a good cardiovascular workout, builds stamina and improves agility and strength.  It's cool and likely to be even cooler, now that an avid hooper, first lady Michelle Obama, is in the White House.

Conduct an Imaginary Orchestra - 14 minutes. 
The gestures and body movements of conducting (think Arturo Toscanini, not Lawrence Welk) significantly boost your pulse rate and, over time, strengthen your heart.  "Noby knows why many orchestra conductors live longer than people in other professions," says Gabe Mirkin, M.D., "but the very act of conducting may be the reason."

Be a Clean Freak - l0 minutes.
Vacuuming gives muscles in your upper body a gentle workout and, if stairs are involved, helps tone the lower body.  A cleaner house helps control such asthma and allergy triggers as pet dander, dust mites and pollen.

Type-email - 19-20 minutes.
While this may strike you as a sedentary activity, keep in mind that a typist burns up to twice as many calories as a couch potato.  Keep in touch with your friends and family.

Chew Gum - 4/12 hours.
Working out your jaw muscles in this way can raise your metabolic rate by 20%,researches at the Mayo Clinic have found.  Xylitol, the sugar substitute used in many sugar0free chewing gums, reduces dental plaque and helps prevent cavities.