For Mackenzie Stumpf, two wheels are too many.A few years ago, the Tarpon Springs High senior got a unicycle for Christmas. She quickly developed a passion for life on one wheel, becoming so proficient on the bike that she can dribble a basketball and play Frisbee while riding it.But that balancing act is nothing compared to the one Stumpf currently performs in the sport she really excels at: Swimming.There are practices and meets to attend, all while trying to fit in recruiting trips to colleges. Last weekend, she went to the University of Miami. This weekend, she is going to the Naval Academy. Later this month, she will travel to Dartmouth.So it is understandable that the unicycle is tucked away in her trunk, at least until the high school swim season ends in November."There is just too much going on right now in swimming to really ride the unicycle," Stumpf said.The primary goal in swimming — besides picking a college — is winning a state title in an individual event. She has come oh-so-close the past two seasons, finishing third in the 200-yard individual medley and 100 breast as a sophomore in 2014 and second in both events as a junior last season.Gulliver Prep's Kelly Fertel, the Class 2A state champion in the 200 IM and 100 breast last season, graduated. That means Stumpf is favored to win titles in both events. If Stumpf takes gold, she will become just the second girls swimmer from her school to win a state individual title, joining Kelsey Buckley, who won the 200 IM in 2010 and '11.There are other reasons Stumpf is confident she can finish her high school career on top of the medal stand. She qualified for three events at the U.S. Olympic swimming trials: the 100 breast, 200 back and 200 breast.The trials were at the CenturyLink Center in Omaha, Neb., a basketball-size venue that holds more than 14,000. The size of such an area can be nerve-wrecking for any swimmer, especially one still in high school.Stumpf was unfazed by the large crowds — and the intense competition.At the trials, she made a quantum leap in the 100 breast, vaulting 62 places from where she was seeded to finished 58th overall with a time of 1 minute, 10.91 seconds."I don't really get nervous at meets so it did not affect me that much at the trials," Stumpf said. "I think being able to produce good times against that kind of competition will only help me gain confidence going into the high school season."That confidence in the pool is due in large part to aquatic bloodlines.Stumpf's mother, Joann, was a swimmer and taught water safety, often giving lessons to children in their community pool in the Westchase area. Stumpf was swimming before she was out of diapers and was usually her mother's assistant during those lessons.Stumpf's older brothers, Ryan and Matt, both swam for Tampa Preparatory and were each state place winners. Her older sister, Caitlin, was a swimmer at Tampa Prep and Palm Harbor University.Now, Stumpf can hold the distinction of being the first state champion from the family if she wins this year.To reach her ultimate goal, Stumpf is focused more on her times."I'm not really big into records or anything like that," Stumpf said. "I just want to keep swimming fast and hopefully I'll win when it counts at the end."Then she can resume life on one wheel.