Help! I know, now that I've hit 40, and the weight has become harder and harder to lose, but how the heck do you exercise when you work full-time, care for two toddlers, and can't afford a health club membership? When I get home at night, I usually have mucho schoolwork to do (a teacher's day is very long, contrary to popular belief), and then I want to do something fun. Is there anything that makes you sweat, ache or get out of breath that is actually fun?