By the time that the rink cleared enough for Brianne to begin her second round of stops, she was sorely tempted to call it a day. Her thighs ached with the strain of keeping her body upright and effortless as she glided around, taking the corners, attempting to keep pace with the boys beside her—which was mortifying, since she knew how slowly they were moving.             “Doing great!”             “Don’t lock your knees.”             “Don’t tense so much!”             “That’s it. Ease into the turn!”             Pleased with herself, she rather felt she’d more-or-less managed to keep from looking downright inept. So, yes, okay she fell twice but as…