Researchers have discovered that simply smelling chocolate before a workout could actually help you squeeze out more reps at the gym. In the study, 23 men who hadn't eaten for at least 10 hours sniffed three different scents between sets: dark chocolate, milk chocolate, and plain water. The guys who smelled dark chocolate managed to crank out about 18 more leg-extension reps than when they sniffed water. Milk chocolate helped too, adding about nine extra reps. And here's the twist... after smelling dark chocolate, they actually felt less hungry.