Olympic medalists teach kids their swimming secrets

A swimmer does the butterfly during a swim workshop held by Olympic medalists at Boys and Girls Club in Knoxville, Tennessee on Saturday, December 30, 2017. Around 20 middle and high school female swimmers attended the Ace Girls USA Swim Workshop to learn about technique, nutrition and training. Calvin Mattheis/News Sentinel

Maddie Henson dives underwater during a swim workshop held by Olympic medalists at Boys and Girls Club in Knoxville, Tennessee on Saturday, December 30, 2017. Around 20 middle and high school female swimmers attended the Ace Girls USA Swim Workshop to learn about technique, nutrition and training. Calvin Mattheis/News Sentinel

Ila Corker, of Knoxville, listens to the lesson during a swim workshop held by Olympic medalists at Boys and Girls Club in Knoxville, Tennessee on Saturday, December 30, 2017. Around 20 middle and high school female swimmers attended the Ace Girls USA Swim Workshop to learn about technique, nutrition and training. Calvin Mattheis/News Sentinel

2012 Olympic gold medalist Claire Donahue watches as swimmers practice during a swim workshop held by Olympic medalists at Boys and Girls Club in Knoxville, Tennessee on Saturday, December 30, 2017. Around 20 middle and high school female swimmers attended the Ace Girls USA Swim Workshop to learn about technique, nutrition and training. Calvin Mattheis/News Sentinel

A swimmer dives into the water during a swim workshop held by Olympic medalists at Boys and Girls Club in Knoxville, Tennessee on Saturday, December 30, 2017. Around 20 middle and high school female swimmers attended the Ace Girls USA Swim Workshop to learn about technique, nutrition and training. Calvin Mattheis/News Sentinel

2012 Olympic gold medalist Claire Donahue helps swimmers with their breast stroke during a swim workshop held by Olympic medalists at Boys and Girls Club in Knoxville, Tennessee on Saturday, December 30, 2017. Around 20 middle and high school female swimmers attended the Ace Girls USA Swim Workshop to learn about technique, nutrition and training. Calvin Mattheis/News Sentinel

A swimmer does the breast stroke during a swim workshop held by Olympic medalists at Boys and Girls Club in Knoxville, Tennessee on Saturday, December 30, 2017. Around 20 middle and high school female swimmers attended the Ace Girls USA Swim Workshop to learn about technique, nutrition and training. Calvin Mattheis/News Sentinel

Three-time Pan American medalist Lisa Blackburn helps Emma Helton, of Johnson City, with her breast stroke during a swim workshop held by Olympic medalists at Boys and Girls Club in Knoxville, Tennessee on Saturday, December 30, 2017. Around 20 middle and high school female swimmers attended the Ace Girls USA Swim Workshop to learn about technique, nutrition and training. Calvin Mattheis/News Sentinel

Six-time Olymic medalist Rebecca Sonni shares a laugh with the group during a swim workshop held by Olympic medalists at Boys and Girls Club in Knoxville, Tennessee on Saturday, December 30, 2017. Around 20 middle and high school female swimmers attended the Ace Girls USA Swim Workshop to learn about technique, nutrition and training. Calvin Mattheis/News Sentinel

Swimmers listen to the lesson during a swim workshop held by Olympic medalists at Boys and Girls Club in Knoxville, Tennessee on Saturday, December 30, 2017. Around 20 middle and high school female swimmers attended the Ace Girls USA Swim Workshop to learn about technique, nutrition and training. Calvin Mattheis/News Sentinel

A swimmer does the breast stroke during a swim workshop held by Olympic medalists at Boys and Girls Club in Knoxville, Tennessee on Saturday, December 30, 2017. Around 20 middle and high school female swimmers attended the Ace Girls USA Swim Workshop to learn about technique, nutrition and training. Calvin Mattheis/News Sentinel

Six-time Olymic medalist Rebecca Sonni helps a swimmer with their breast stroke during a swim workshop held by Olympic medalists at Boys and Girls Club in Knoxville, Tennessee on Saturday, December 30, 2017. Around 20 middle and high school female swimmers attended the Ace Girls USA Swim Workshop to learn about technique, nutrition and training. Calvin Mattheis/News Sentinel

Swimmers listen to instruction during a swim workshop held by Olympic medalists at Boys and Girls Club in Knoxville, Tennessee on Saturday, December 30, 2017. Around 20 middle and high school female swimmers attended the Ace Girls USA Swim Workshop to learn about technique, nutrition and training. Calvin Mattheis/News Sentinel

Lindsey Kizer swims underwater during a swim workshop held by Olympic medalists at Boys and Girls Club in Knoxville, Tennessee on Saturday, December 30, 2017. Around 20 middle and high school female swimmers attended the Ace Girls USA Swim Workshop to learn about technique, nutrition and training. Calvin Mattheis/News Sentinel

Leah Hinsley, right, jokes with Maddie Henson, left, during a swim workshop held by Olympic medalists at Boys and Girls Club in Knoxville, Tennessee on Saturday, December 30, 2017. Around 20 middle and high school female swimmers attended the Ace Girls USA Swim Workshop to learn about technique, nutrition and training. Calvin Mattheis/News Sentinel

Lindsey Kizer does the breast stroke during a swim workshop held by Olympic medalists at Boys and Girls Club in Knoxville, Tennessee on Saturday, December 30, 2017. Around 20 middle and high school female swimmers attended the Ace Girls USA Swim Workshop to learn about technique, nutrition and training. Calvin Mattheis/News Sentinel

Swimmers listen to the lesson during a swim workshop held by Olympic medalists at Boys and Girls Club in Knoxville, Tennessee on Saturday, December 30, 2017. Around 20 middle and high school female swimmers attended the Ace Girls USA Swim Workshop to learn about technique, nutrition and training. Calvin Mattheis/News Sentinel