Phelps began swimming at the age of seven, partly because of the influence of his sisters and partly to provide him with an outlet for his energy.[15] When Phelps was in the sixth grade, he was diagnosed with attention deficit hyperactivity disorder (ADHD).[16][17] By the age of 10, he held a national record for his age group, and Phelps began to train at the North Baltimore Aquatic Club under coach Bob Bowman. More age group records followed, and Phelps's rapid improvement culminated in his qualifying for the 2000 Summer Olympics at the age of 15 and becoming the youngest male to make a U.S. Olympic swim team in 68 years.[18] While he did not win a medal, he did make the finals and finished fifth in the 200-meter butterfly.[19]