Lindley grew up in Greenwich, Connecticut, as an athletic and shy child. She attended Greenwich High School, where she played field hockey, ice hockey, and lacrosse. She later attended Brown University, where she played at the varsity level in the same three sports and graduated with a degree in psychology. Following graduation, she spent two years coaching field hockey and lacrosse - one year at Princeton University and one year at Lehigh University. In 1992 Lindley competed in her first triathlon without having much prior knowledge or training in swimming. She trained while working 60-hour weeks at a local YMCA in Worcester, Massachusetts. In 1996 she began competing in ITU World Cup races and was consistently producing top-10 finishes in 1999 under coach Jack Ralston. By 2000 she was focusing on qualifying for the 2000 Summer Olympics, the year the triathlon was making its first appearance in the Olympic program. At the U.S. Olympic Trials in Dallas, Lindley failed to take one of the top two spots in the race to qualify, but instead took third and accompanied the team to Sydney as an alternate. Thereafter, she made some changes in her training, including joining coach Brett Sutton's squad at the suggestion of Loretta Harrop. Soon after joining his squad, Sutton had her race in the 2000 ITU Duathlon World Championships, where she took second place. In 2001, she won six consecutive ITU World Cup races and captured the ITU World Championship title, accumulating enough points to be ranked as the top female ITU triathlete in the world. The next year, in 2002, she maintained her No. 1 ranking while repeating as the winner of the World Cup series. After that year, she decided to retire from triathlon competition to pursue what she considered her true career calling as a coach. She credits much of her success in 2001 and 2002, when she won 11 World Cup races, as well as her success as a coach, to Sutton. Among her accomplishments as a coach is coaching Susan Williams to an Olympic Bronze medal at the 2004 Olympics, and Mirinda Carfrae to three Ironman World Championships. and one 70.3 World Championship 2007. Siri Also Coached Leanda Cave to an Ironman World Championship in 2012 and a 70.3 World Championship the same year. Lindley is the author of Surfacing: From the Depths of Self-Doubt to Winning Big and Living Fearlessly. Additionally, she is a speaker with Keppler Speakers as well as being involved in speaking engagements with Tony Robbins. She is the co-founder of Believe Ranch and Rescue, a non-profit focused on rescuing horses from slaughter. Lindley is married to former professional triathlete Rebekah Keat. In November 2019 she was diagnosed with acute myeloid leukemia and she has participated in a clinical trial at the University of Colorado Anschutz Medical Campus. Denver7 awarded Lindley and Keat the 7Everyday Heroes Award for their work saving horses from slaughter and caring for them or finding them homes.