Many think that sex is a great calorie-burner, however, a study conducted by the University of Alabama at Birmingham proved this popular myth wrong. This is based on the assumption that people were engaging in hot love sessions that lasted an hour or longer when the reality is, on the average, people spend six minutes per sexual encounter. This correspondingly amounts to burning merely 21 calories, compared to burning 25 calories by standing up for ten minutes.
On the other hand, knitters who can work those needles burn 55 calories for half an hour. Also, busy hands make for less munching. To burn even more calories while knitting, work your abdominal muscles. Sit tall and place both feet on the floor. Support your lower back with extra pillows behind you, if needed. Tighten your abs and hold them in for as long as you can. The longer you hold the contraction, the more intensely you work your abdominal muscles, the more additional calories you burn.
So next time you want to get a good work out get out of bed, take a hold of your knitting needles, a ball of yarn and sit for a couple of hours.