Our instructors make all the difference in helping you bring 'power to your core'!  Decades of experience combine to provide you with an amazing class experience every visit.


An adventure seeker and fitness enthusiast, Cari Allen has brought core 3 to the St. Louis area!   In addition to teaching fitness classes for the past 20 years, Cari has also completed the Boston Marathon, Ironman Florida, Assault on Mount Mitchell and many other outdoor adventures.  Come and see what all the buzz is about and take your fitness to the next level with core 3!



Cheryl Waites has been teaching indoor cycling for 15 years.  She is passionate about making each class experience an opportunity for riders to "do more".  She believes that every rider, experienced or new, should leave a cycling class feeling like they have taken themselves farther than they imagined they could.  She is excited about the  the RealRyder technology and the benefits it will bring to cycling classes, including a better core and upper body workout.  Cheryl has competed in numerous triathlons, including 5 Ironman triathlons.  She is thrilled about sharing her enthusiasm for cycling and fitness at core 3! 

Cori Rootz





Since Heather was young, Heather has been active in  team sports.  When she was a college student she started practicing yoga and was immediately hooked by the mental and physical benefits of yoga!  As her fitness path continued, Heather took her love for teaching beyond the elementary school classroom and became a RYT through Yoga Alliance and a cycling instructor.   Since 2010 she has been a group fitness instructor leading a variety of yoga classes, cycling classes and a fusion of both!  Heather is thrilled to bring her experience to core 3!