Runner's high occurs during moderate to intense aerobics, when natural chemicals called endocannabinoids activate the part of the brain associated with "feeling good."
Madonna credits her hard body to yoga. Jennifer Aniston owes her lean muscles to pilates. A-listers seem to know which discipline is right for their bodies, but do you?
It started out as a maze in 1973, and now includes incredible optical illusions, a puzzle cafe, and eccentric architecture such as the remarkable Leaning Tower of Wanaka.