best commuter exercise (2008)

THE 9TH STREET N-F TRANSFER

Escher would've loved THE 9TH STREET N-F TRANSFER. It wraps six staircases around six corners—81 steps in all. A Crunch Stair-master burns about 300 calories in 20 minutes, but this is tougher and cheaper. Manhattan designer Lily Lee lugged two chairs from her parents' house in Brooklyn up the transfer and laughed breathlessly, "One good thing about the chairs—at the top of the steps you get to sit on them."

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