Hayley Peterson was enjoying a few beers at Gottscheer Hall in Queens when a staffer asked if her table wanted to participate in the bar’s steinholding competition.

She’d never held a stein — competitively, that is — but the concept isn’t too tough to grasp: Participants must hold a 5-pound liter of beer with their arm extended, parallel to the floor, for as long as they can.

Bending the elbow or leaning too far back can get you in trouble. Spilling the beer is an automatic out. Drinking it is a (warm, flat) afterthought.

“We’re young and hot,” Peterson, 28, told The Post. “We might as well.” 10

Little did she know that 3 minutes and 21 seconds later, she’d be the last woman standing — and receive the honor of representing the venue at the US HB Masskrugstemmen Finals in Centr

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