Plug in a particular activity (running, skating, gardening, etc.), your weight and the amount of time you plan to do the exercise, and voila: you get a count of the calories you'll burn.

CNN: Site Seer: Get fit on the Net

The cost of sending your child to an after school program may be a qualifying expense, even if it focuses on a particular activity.

FORBES: Back to School: Deductions for Soccer, Cheerleading and Extracurricular Activities?