Hillary is a former professional triathlete and ultra-endurance athlete. During her decades-long career, Hillary became one of the most decorated competitors on the Ironman (in her case Ironwoman) circuit, completing 66 iron-distance triathlons and winning Ironman Wisconsin in 2008. In 2013, she won the Ultra Man World Championship in Hawaii. Currently, Hillary coaches endurance athletes out of Biscay Coaching and is co-owner and operator of the apparel brand Smashfest Queen.