After finishing 1-2 in the world this year, American triathletes Gwen Jorgensen and Sarah Groff are rolling toward Olympics in Rio ... and perhaps the USA's first gold medal in the event

Gwen Jorgensen and Sarah Groff were teammates on the U.S. Olympic team at London in 2012, and both came up short of their expectations. But in the two years since, both have improved greatly. Now 1-2 in the world, they're eager to help the U.S. win its first gold medal in the American-born event at the 2016 Olympics. My story for ESPN.com's Endurance Sports section: http://espn.go.com/sports/endurance/story/_/id/11669017/endurance-sports-sarah-groff-gwen-jorgensen-aiming-triathlon-gold-medals-rio