Crunches not getting you into those jeans? Blame your genes, and eat smaller lunches.

the Mail online | Health | Genes make exercise a waste of time:
"No matter how hard we try, a study suggests, four in ten of us simply do not gain any physical benefit from exercising."

Now, if they just had an easy, "no sweating required" test for this, I could take the test, find out I was in the "all pain and no gain" group, and stop feeling guilty about not exercising enough. Of course, I'd have to feel more guilty about my calorie intake to make up for it.