“It had turned out that climbing a tree was more difficult than it looked. It was harder than warrior pose in yoga, than teaser in Pilates, than the elliptical or the Reformer. Rebecca thought that if no one had thought of it yet, soon enough someone in the city would spearhead a craze for tree climbing in Central and Prospect Parks, and it would become the talk of every cocktail party: have you tried that large oak by the Sheep Meadow? Oh, it’s completely changed my body.”