Sexercise!
Fitness Magazine would like you to know that some sex positions are better for you than others. Not for pleasure, oh no, but for pumping those glutes and crunking those fubs! It's a slideshow, so prepare for dismissing annoying overlay ads, but you do get ten little line-drawings of fit people having sex. The positions they cover are, pretty much the main positions we all use, so, really, if this were true, there's be a whole lot more physically fit people than there actually are. I'd like to see the bad positions for exercise; maybe we're all doing the fucking that just makes us fat.