Quickest way to burn fat

Top 3 in no order. Having sex, swimming, and high intensity rollerblading.

But there are hundreds of ways. One can start slow and work up to high intensity and presumably weight loss would increase ones chances of getting to have sex to lose more weight. A known statistic is that if one were to walk for an extra hour a day in a year they would lose a stone (6.3kg or approx 7 pounds)