The Jill Kintner that will compete in Wednesday’s Olympic BMX finals is not the same woman who took her third world title in four-cross mountain biking just 11 months ago. Sure, she still boasts the same chatty personality, curly ponytail and toothy grin — those qualities aren’t going anywhere. But the Kintner of today is a bigger, badder, stronger version of her former self. Bulging triceps flex from under her shirtsleeves, thick hamstrings and quads fill out her jeans.

She’s …

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