Trainers
Our trainers are experienced and passionate about what they do. They understand that no two bodies are alike and will meet you where you’re at—helping you feel stronger, healthier, and more capable every step of the way.
Lili Hansen
About Lili:
Most likely, you’ll find Lili out on a trail or playing with her family. She’s built her career where fun, the outdoors, and exercise meet. Her love of movement began in the Marin Headlands, where she grew up running, later competing for Gonzaga’s Division I cross-country team. After college, she discovered the strength, balance, and confidence weightlifting adds—not just to running, but to everyday life.
In the gym, Lili’s motto is simple: prepare you to feel your best—on the slopes, on the trail, or on the playground. She values the time people spend in her classes and makes every session worth it with fun music, motivating energy, and workouts that are both challenging and engaging.
Contact Lili
Email: lilihansen1@gmail.com
Sophie Curl
About Sophie:
Sophie is an ACE-certified group fitness instructor, personal trainer, and registered nurse at St. Luke’s. A former NCAA Division I track and cross-country athlete, she has a strong running background and a love for alpine & nordic skiing, mountain biking, and keeping up with her two young girls.
Her workouts are efficient, energizing, and backed by a high-quality playlist—designed to build strength, longevity, and confidence for any mountain adventure.
Contact Sophie
Email: sophielcurl@gmail.com
Meggie Rose - Owner
About Meggie:
Raised in the Wood River Valley, Meggie’s passion for movement has always been rooted in the mountains. As a young cross-country runner, she discovered early on that strength training was the key to not just performance, but longevity—and she’s been hooked ever since.
Now with over a decade of experience as a certified personal trainer and group fitness coach, Meggie blends strength, endurance, and stability into every program she leads. Her training style is designed to build strong, balanced, and resilient bodies that can keep up with all the outdoor adventures mountain life has to offer.
Contact Meggie
Email: meggierosefitness@gmail.com
Shannon Brandenburg
About Shannon:
As a dedicated runner and a busy mom of 3, Shannon knows the importance of efficiency in training. In Shannon's run mill classes, you'll get a balanced workout that incorporates speed, strength, endurance and hills. This high-energy and community focused class is the perfect addition to any training regimen.
Contact Shannon
Email: shannon@mountain-town.com
Brooke Rosenthal
About Brooke:
Brooke is a certified personal trainer and group fitness coach and brings a passion for health, movement, strength, and helping others feel their best—inside and out. As a mom of two littles, marketing manager, and coach, she knows life gets busy and believes fitness should feel empowering and be enjoyable. Her classes are high-energy, form-focused, and always welcoming—whether you’re brand new to fitness or leveling up your strength. Come as you are—you’ll leave stronger.
Contact Brooke:
Email: brookeklawley@gmail.com
Kelli Lusk
About Kelli:
Kelli began running in 1984 and went on to compete in high school cross-country and track in Michigan before adding mountain bike racing to the mix. She’s raced everything from 5Ks to marathons—qualifying for the 100th Boston Marathon in 1995 and the 2000 U.S. Olympic Marathon Trials. A two-time member of the U.S. National Mountain Running Team, she’s competed internationally in mountain and trail races and was the 2003 National Snowshoe Racing Champion. Kelli brings this wealth of experience and her specialized run programming to every Run Mill class, ensuring you leave feeling strong, fast, and ready to tackle any mountain adventure.
Contact Kelli
Email: luskelli@gmail.com
Houston Deck
About Houston:
Houston became the High Performance Coordinator at the Julia Argyros Training Center in 2024. Before that, he was the Director of Strength and Conditioning at Barca Residency Academy in Arizona, where he designed and led athletic development for U14–U19 soccer teams. He also worked with U.S. Ski & Snowboard as an Athletic Development Coach, creating strength and conditioning programs for rookie and national freeski and freestyle athletes.
Outside of work, Houston loves mountain biking, running, bouldering, swimming in any spot he can find, and testing how far his RAV4 can make it down a dirt road.
Contact Houston:
Email: HDeck94@gmail.com
Anneke Efinger
About Anni:
Born and raised in Park City, Utah, Anni grew up skiing and playing competitive soccer, eventually playing Division 1 at Loyola Marymount University. Her passion for fitness and strength training led her to earn a degree in Health and Exercise Science from Colorado State University, launching her career in the fitness world.
She began teaching group fitness in Denver in 2018 and later built her own online business during the pandemic. After living in mountain towns across Colorado and Montana, Anni landed in her favorite one yet—Sun Valley.
At The Mill, Anni blends her experience with strength, and functional training to deliver high‑intensity, low‑impact workouts designed to keep you strong, balanced, and ready for every mountain adventure.
Contact Anni:
Email: annekeefinger@gmail.com