Like learning to use chopsticks, roller-skating takes patience, dedication, and a particularly dexterous set of toes. Observe flexible feet in action with today’s Groupon: for $7, you get one general-admission ticket to the Suburbia Roller Derby bout on Saturday, June 11 in Yonkers (a $12 value in advance; a $15 value at the door). Children younger than 8 are admitted for free with an accompanying adult. Doors open at 5 p.m., and the first bout starts at 6 p.m.

One of New York’s first all-girl, flat-track roller-derby leagues, Suburbia Roller Derby fells female athletes for sport during fast-moving bouts. Adrenaline-pumping roller-derby games run as two-minute races, or jams, between two opposing teams and one swiftly roller-skating rabbit. Skating in laps, each team’s point-scoring jammer tries to bust through three oncoming blockers tailed by a pivot player to maintain the jam’s pace and yaw. The aggressive game bashes blockers and hammers jammers in close proximity to spectators, forcing onlookers to confront their fears of helmets and kneepads.

Suburbia Roller Derby assembles rough-and-tumble skaters in all-star and B-teams, recruiting women age 18–50 from corporate jobs, prestigious colleges, and progressive nunneries. Founded by two former Connecticut Roller Girls, the Westchester league has grown to roughly 40 strong, recently gaining membership to the Women's Flat Track Derby Association.