As Lia Thomas Swims, Debate About Transgender Athletes Swirls

BOSTON — As Samantha Shelton, an accomplished Harvard swimmer, churned through the water in the 100-yard women’s freestyle on Saturday afternoon, the University of Pennsylvania’s Lia Thomas seemed content to sit on her hip in the adjacent lane.

Shelton chugged ahead from the start, plowing through the water and carrying the lead. But as she did, Thomas cruised along beside her, seeming as unhurried as if on a training swim. Thomas’s broad shoulders and long arms, hallmark features of an elite swimmer, mimicked a windmill with the ease in which they pulled her along.

Then came the final turn.

As Shelton came out of it continuing to fight, on her way to a season-best time, Thomas, with her long, rhythmic, powerful stroke, ate up the margin between them until she had surged past for a near body-length victory. A moment later, the swimmers removed their goggles and acknowledged each other, Thomas reaching over the rope to offer a fist bump to a smiling Shelton.