Our Coaches

Dr. David Eric Boll, CKTP, NASM-PES

David Boll, D.C., CKTP, NASM-PES

Owner of Apex Athletic Performance and Rehabilitation


Dr. David Eric Boll is a native of Cedar Lake, WI.  He attended New Holstein High School and completed his undergraduate work at the University of Wisconsin-Oshkosh.  He graduated from the Davenport, Iowa campus of Palmer College of Chiropractic in 1992.


Dr. Boll is licensed in both Wisconsin and Michigan as a chiropractor. Dr. Boll also completed an educational program as a Performance Enhancement Specialist from the National Academy of Sports Medicine (NASM-PES). He had a private chiropractic practice in the Fox River Valley through 2007.  Dr. Boll scaled back from clinical practice full-time in 2008 due to sports injuries....and added athletic performance training and conditioning coaching, allowing him to work in the coaching and training arena while still being able to work with athletes rehabilitation needs under his chiropractic license. 


Dr. Boll works with professional and recreational athletes in the areas of cycling, rugby, hockey, running, cross country skiing, soccer, football and volleyball.  Along with amateur athletes, he has worked with NFL players, WWE performers and many champions in motorsports, to include World and National Champions in motorcycle road racing.  He currently is a conditioning and strategy coach for the Sheboygan Silverbacks rugby program, assistant coach for the Kettle Moraine Nordic Ski racing team ("The STORM"), works with the AMA Pro Roadracing motorcycle racing series and locally helps athletes of all levels to naturally maximize their physical sporting potential, like the Grafton Rangers and Fox Cities Gargoyles. He has training clients from California to England.


He has had articles written on his work with the racing community in both racing and professional trade magazines.


Please contact us for a complete professional C.V.




Callie Helminger

Callie Helminger is a native of Random Lake Wisconsin. She attended UW- Stout for her first two years of undergraduate study in health wellness and fitness. She decided to continue her studies by transferring to Colorado Mesa University (CMU) in the fall of 2017 to follow her dream of obtaining a degree in exercise science. She also plans on continuing study after her undergraduate with a masters in exercise physiology.

She currently works at Mesa Fitness in Grand Junction, CO while attending CMU. 

Callie has spent her lifetime participating in an array of sports from soccer, basketball, volleyball, softball, rugby, and is now pursuing the new sport of powerlifting/competitive lifting. While in high school Callie was a varsity athlete all four years and was regularly recognized for her athletic ability. She captained her softball, volleyball, and basketball teams, and was awarded multiple conference awards. 

Callie hopes in the near future to complete her CPT (certified personal trainer) exam, and build off that by becoming a certified strength and conditioning coach through NASM and NSCA. She hopes to one day work with athletes from the high school to professional level. 





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