436 1st Street, Lake Oswego, OR 97034    (503) 908-0024


The IM=X® Pilates Team is Qualified To Help You Reach Your Goals

Our instructors receive top-notch training in our scientifically-proven method for success. All instructors attend premiere certification courses and continuing education on our unique movement formats so that they are constantly on the forefront of the fitness field. Whether you are looking to lose inches, improve performance, reduce back pain, prevent injury, or tone up, our instructors are equipped and ready to help you meet your goals!

Rhonda Webber
Owner/Advanced Trainer

Rhonda Webber is the owner and manager of IM=X Pilates Lake Oswego along with her husband Mike. Rhonda is a lifelong health and fitness enthusiast and has 34 years experience in customer service and business management, including many years with both Nike and Nordstrom. Rhonda is certified as both an IM=X Pilates instructor and a Spin Instructor, and has completed both her IM=X Advanced certification in 2010 and IM=X Super Advanced certification in 2011. Rhonda along with her husband and 16yr old son live in West Linn and purchased their IM=X franchise in 2008 after hearing rave reviews from customers and trainers around the country about the IM=X Pilates franchise system.

Barbara Dieringer
Advanced Trainer

As a former Physical therapy aide and a current Licensed Massage Therapist, Barbara emphasizes the importance of building a strong core to prevent injuries. Teaching IM=X Pilates for the past 12 years, Barbara has seen exceptional progress with clients by increasing their overall strength and flexibility. Barbara completed her IM=X Pilates Super Advanced certification in 2012. A fitness enthusiast in her spare time, Barbara enjoys hiking, biking, snowshoeing and kayaking as well as spending time with her fiance' Al, her grown children and of course her Lhasa Apso, Gracie!

Brittney Hock
Advanced Trainer

Brittney has had a passion for fitness and nutrition for as long as she can remember. She started with IM=X Pilates while recovering from a shoulder injury and fell in love with the amazing benefits IMX provided. In addition to being a pilates enthusiast, Brittney is an avid runner and has colmpleted several half marathons. Brittney as her IM=X Basic Pilates certification and her Super Advanced certification as well as her Schwinn cycling certification. Brittney as a background in Public Relations and received her BA from UC San Diego. In her free time, Brittney enjoys spending time with her family and traveling and lives in Lake Oswego.

Sarah Tripp Stephan
Advanced Trainer

An avid fitness and outdoor enthusiast, Sarah brings an expansive background to IM=X Pilates that includes competitive ski racing, soccer, triathlons, mountain biking and tennis. Her integrated approach blends the unique cardio benefits of IM=X with full-body strength conditioning to help people achieve their personal fitness goals. Sarah has completed both her IM=X Basic and Super Advanced certifications and is pursuing her 500hr yoga certification as well. Sarah is a parent of 2 teens and lives in Lake Oswego and holds a B.A. in English from Carleton College.

Luanne Jaramillo
Advanced Trainer

Luanne has always enjoyed being active! She is an avid runner and personal trainer out of her home in Beaverton. She and her husband, Aaron, along with their two teenage daughters enjoy swimming, biking and even running together! Luanne enjoys running half-marathons, hiking and even a triathlon or two. In her spare time, Luanne coaches track for her daughters school. Luanne has both her Basic and Advanced IM=X Pilates Reformer Certifications along with her TRX Suspension trainer certification. Luanne is passionate about helping people reach their goals. Her love for people along with her love of being active brought her into the fitness industry. Luanne also holds a BS in Psychology from George Fox University.

Sheri Grant
Advanced Trainer

Sheri Grant grew up in South Africa where her father was a leading expert in the Health and Fitness industry. Hy Able was a pioneer in the diet industry and owner of a world-renowned fitness and health center. Sheri grew up in a world of fitness and body consciousness and has 35 years of training in ballet, modern jazz, contemporary dance, martial arts, yoga and Pilates. She has worked as a fitness instructor, personal trainer and wellness consultant in South Africa, Canada and America and trained celebrities including Sidney Sheldon, Laura Hunt and many others. Sheri danced professionally and toured for 6yrs with various dance companies. Sheri has her Basic and Advanced IM=X Pilates Reformer certifications and teaches several classes each week as well as working with private and duet training clients.

Monica Mabee
Advanced Trainer

Monica was born into fitness, always exploring, trying new activities and enjoying the challenge of pushing the body and mind. She embraces living a healthy lifestyle....possibly with a glass of wine or two. She thoroughly enjoys visiting her family in the Bay Area where she was born and raised. Growing up she trained in ballet, tap, jazz and modern dance, as well as being a competitive softball player. Now living in Oregon for over a decade, she fills her time with getting lost in nature while backpacking, running, and promoting her business at local comic-book conventions. After being a student at IM=X Pilates and seeing the benefits of how it personally helped her with overall strength and core stability (more than she ever experienced!) she knew she wanted to pass this training onto others. Monica became an IM=X Pilates instructor in early 2015 and now has her Advanced certification as well. When she is not in the studio teaching she is managing a Physical Therapy center in Lake Oswego.

Tracy Myers
Advanced Trainer

Tracy's background is in aviation, but she has always had a passion for fitness and nutrition. She began IM=X Pilates when she and her husband moved to West Linn during the summer of 2011. Immediately she fell in love with the workout and the results. Tracy became a certified IM=X Pilates Reformer instructor in July 2013 and has also completed her Advanced certification as well. Tracy has always enjoyed teaching. Her past experience includes flight instruction as well as teaching courses at an aviation college. She is currently taking time away from her last position as an airline pilot so that she can stay home with her daughter who was born in September of 2013.

Taissa Achcar-Winkels
Advanced Trainer

Taissa was born in Rio De Janeiro, Brazil and grew up also living in Caracas, Venezuela for over a decade (English is her 3rd language). She moved with her parents and sister to Minneapolis while in High School and attended the University of Minnesota where she received a Masters in Architecture Degree. In 2010 Taissa and her husband along with her teenage kids relocated to Lake Oswego because of its quaint and small town feeling and all Oregon has to offer. Taissa has always been an athlete and has coached swimming and volleyball and is always looking for fun ways to stay in shape. Taissa was introduced to IMX Pilates 3yrs ago and felt it was the perfect combination of balance, strength, flexibility, core stabilization and cardio workout and after such a great experience as a student she decided to become a certified IM=X Pilates instructor in 2015 and has also completed her Advanced certification as well. Taissa has enjoyed meeting so many great people at the studio and is always looking forward to the next challenge!

Stacia O'Leary
Advanced Trainer

Stacia was born and raised in Eastern Washington & Idaho. Growing up in a very active family, she swam competitively and trained in various styles of music & dance. Her passion for teaching started as a swim instructor & later became certified with the Aerobics & Fitness Association of America as a fitness instructor. Teaching and promoting health have always been natural part of her life and upon finding IM=X Pilates, she quickly committed to making it a permanent part of her lifestyle. She continues to enjoy exploring new physical challenges and has completed two half-marathons. Aside from her fitness endeavors, she loves to explore outdoors, SUP, write and create art in various mediums. Stacia and her husband live in Lake Oswego with their three children, 9, 6 and 4.

"These moves are designed not only to tone and elongate your muscles, but also to improve your posture and help your back. So try them and start reaping the benefits"

— Fit Magazine