About Revival Strength

Revival Strength was founded by Marcus Filly to help clients from diverse fitness backgrounds fall in love with their training. Whether you get personalized individual training with one of our coaches locally in San Rafael, CA or remotely, or join our online group training program, we are here to support your fitness. Find out more about our coaches and contact us if you’d like to learn more about any of our programs.


We are always looking for experienced coaches to join our growing team. For inquiries contact [email protected]. We are also hiring now for sales and marketing positions.


Owner, Head Coach

Marcus grew up in the San Francisco Bay Area. He played multiple sports as a child including soccer, baseball and golf, which eventually led to a collegiate career in soccer at the University of California, Berkeley. There he earned his degree in Molecular and Cell Biology with an emphasis in Nutrition and Physiology. After Berkeley he complete a year of graduate work at the Ohio State University School of Medicine.


His interest in both athletics and human health and performance eventually led him to CrossFit in 2007. He has gone on to compete at the CrossFit Games 6 times, three times as an individual (2016 12th fittest) and three times as a team member (2012 6th fittest team). Marcus is also the captain and member of the Phoenix Rise in the NPGL. For two years he has been voted to the all GRID league team, in 2016 earning 1st team honors, and in 2015 earning the award for leadership excellence.


Marcus has been a health and fitness coach for 8 years since leaving Medical School in 2009. He was formerly a CrossFit facility owner for 5 years, has completed all 5 of the OPEX CCP courses, and has coached clients remotely from all over the world. He has coached athletes at the CrossFit Games as well as several Regionals athletes.


He lives with his wife Megan, and two daughters. He lists his parents, Barbara and Roy, as his role models and drive to succeed in life.


Honesty. Commitment. Persistence. Read more about Marcus’s story and how it all began.



Shanna Guzman swam for the Terrapin Swim Team in Concord as an age group swimmer and through high school. She went on to compete for Southern Methodist University and later transferred to University of San Diego and finished her college swimming. Post college she competed in olympic distance Triathlon, Master’s Swimming for The Olympic Club, and competed in marathons. As a Master’s swimmer she won a world Championship in the 200m Back in 2006 and multiple national titles from 2006-2012.  She also qualified and ran in the Boston Marathon in 2013. In 2016 she started her journey as a Master’s athlete in CrossFit.


Shanna’s background in coaching fitness stems back to 2004 when she first got her NASM Personal Trainer Certification. In Santa Cruz, she began coaching through personal training and group fitness classes at Optimal Health and Fitness.  At that time she coached age group swimming for Santa Cruz County Aquatics and Masters Swimming at Simpkins Swim Center. In 2010, she made her move to San Francisco and continued her personal training and coaching at Breakaway Performance. She soon came across the sport of fitness at TJs Gym in Mill Valley and had started to implement CrossFit for her own training in endurance sports. In 2012, she began her career as a coach in the sport of fitness. She continues to do personal training and individual program design for athletes that have a variety of goals, including competitive CrossFit. She is currently enrolled in the OPEX Coaches Certification Program where she gains new perspectives on program design, nutrition, and lifestyle.


Keith DeNinno has been involved with athletics his entire life.  He has participated in multiple sports growing up, finally latching onto soccer in high school and through college.  He graduated from Penn State with a Bachelors of Science in Mechanical Engineering Technology in 2010.  Yet his passion for sports and fitness never dwindled.  After a few short years of working full time in Engineering and part time coaching in a CrossFit® facility, he finally had the opportunity to make the switch to full time coach in 2015.

With his background in Engineering, Keith can’t help but to take an analytical approach to coaching.  As an Engineer, he was trained to be a problem solver.  He never settles for not having an answer, therefore he prides himself on his determination to find the answer and solve the problem.  He is constantly keeping himself up to date with the latest research and health and fitness information.  However, the core of his success comes from his burning passion to help others through the world of health and fitness.  He is interested in connecting with clients on any fitness journey!


OPEX CCP Level 1
Precision Nutrition Level 1
IYCA High School Strength and Conditioning Specialist (HSSCS)
IYCA Long Term Athlete Development
FMS Level 1
Olympic Lifting seminar with Don McCauley
CrossFit® Level 1 (expired)


Ryan Rivera grew up in Madera CA. He has always lived an active life starting at an early age playing soccer and baseball. He kept playing both sports all throughout high school and when the time came to play collegiately, this is when he found his interest in the Strength and Conditioning aspect for sports and health.


His interest led him to pursue a career in the fitness industry starting in 2010 by accumulating NASM and ISSA personal training certifications. Shortly after he acquired his CrossFit L1 and started coaching at his local gym. In 2014 he noticed his personal fitness was lacking and he wasn’t satisfied with the results he was getting, he knew he needed something more. Ryan reached out to Marcus Filly for Individualized Programming and it was the answer he was looking for.


He wanted to share the same he experienced with others, so he began personally coaching people himself. He went through the OPT Assessment and Design modules and then eventually all 5 of the OPEX CCP Modules. Through his experience and the experience others have shared with him, he believes an individual approach to lifestyle, nutrition and program design is the most fulfilling approach to fitness that lasts a lifetime. 


Anthony Mihelich enjoyed a variety of sports in his youth and began weight training in high school. Despite not being the strongest, fastest, or most athletic, it “clicked” that by putting in the right work, the results showed up — without question. This gave Anthony the confidence and drive to pursue further athletic challenges in high school and college, participating in football, lacrosse, and wrestling. Collegiate sports allowed Anthony to fine tune his athletic skill set such as proper mechanics and injury prevention. Eager to broaden his knowledge base, he began assisting a physical therapist in order to deepen his understanding of physiology and human anatomy.


After a few devastating knee injuries in high school and college resulting in multiple surgeries, Anthony was convinced he would never participate in competitive sports or even intense physical training ever again. He was then introduced to CrossFit in the spring of 2014 by a close friend, where he instantly wanted to join in the fun, but was initially concerned with the amount of volume after injury. To his surprise he felt instant relief after struggling with pain for years. He then understood experientially that, when performed properly, CrossFit could not only prevent injury, but also rehabilitate any and all injuries suffered outside and actually support your ability to function optimally in the real world.


During a period of travel in Southeast Asia, Anthony landed in Koh Tao, Thailand, where he began coaching part time in exchange for membership at a small CrossFit gym. Through helping grow the membership by creating a better client experience, Anthony discovered his love of being of service to others. Anthony wants to focus his complete attention on helping his clients achieve their goals through nutritional and lifestyle guidance and an emphasis on technique. He says, “Nothing is more satisfying to me than seeing an individual surpass their own thoughts of what is possible and becoming more physically and emotionally stronger than they have ever imagined.”


OPEX CCP Level 1 Coach (In Progress)
CrossFit Level 1 Trainer
CrossFit Level 2 Trainer
CrossFit Endurance Trainer w/ Brian McKenzie
CrossFit Mobility Trainer w/ Kelly Starrett
USA Weightlifting Certified
Yin Yoga Certified w/ Debi Daly
First AID & AED


Brianna Lamb is a two time CrossFit Games Regionals Affiliate Competitor and former NCAA All-Conference Division 1 Rower. Brianna grew up in Marin County and began her athletic journey at a young age, playing basketball and swimming at a national level. She started rowing for Marin Rowing Association her junior year of high school and earned a full ride scholarship to row for the University of San Diego. She was an All-Conference Varsity 8+ rower for all four years, earning 3 Conference Championship titles and the first berth in NCAA Championships in school history, where they took 15th place in the nation. Brianna took 8th place in the NorCal Region of the 2017 CrossFit Open and competed in the Affiliate Division of the CrossFit Games Regionals in 2016 and 2017. Brianna is currently training for her first individual appearance in the CrossFit Games and is coached by Mike Lee, General Manager and Head of Coaching at OPEX. 


Through Brianna’s competitive journey, she developed a passion for supporting others in reaching their goals both in and out of the gym. In 2014, upon graduating from the USD, she began personal training and coaching group fitness classes at TJ’s Gym. In 2015, Brianna moved to Honolulu to compete for CrossFit 808. During this time, she expanded her own remote coaching business which included life coaching, nutritional guidance and program design. She is currently enrolled in the OPEX Coaches Certification Program and continues to coach both remotely and on-site at Revival Strength. 



OPEX CCP Candidate
CrossFit-Level 1 Trainer
CrossFit Weightlifting Coach
CrossFit Adaptive Coach
First Aid & AED


Andrew Simmerling

is a career coach with a background in athletics, Rehabilitation and Physical Therapy, Performance Testing and Research, and Personal Coaching. He is a former NJCAA Collegiate Baseball Player and Pitcher in the competitive Panhandle Conference at Tallahassee Community College.

After retiring his baseball career, Andrew went on to achieve his Bachelors in Science degree at Florida State University in 2014 with a focus on research and human performance. He held a job while acquiring his degree as a coach part of the Michelle Obama “get moving” initiative for kids at local schools. He and his team focused on a combination of circuit training and sports for kids to inspire them to make health and movement a part of their everyday life. Also while in school at FSU he worked as an assistant at an outpatient Physically Therapy clinic, where he would accumulate over 3,000 hours of experience and cemented his passion to pursue a career path in health and fitness.

Seeking a new avenue to connect with people and clients looking to better their health, he earned his CPT from the American College of Sports Medicine and  began Personal Training clients in Chicago, IL in 2016. Starting his career at Equinox, he earned Tier 3 Status within 1 year and changed the lives of over 50 clients in his 2 year career there.  Andrew continued coaching in Chicago with Fast and Fit Coaching, learning from prominent local Strength Coach and Endurance specialist, Mike Thomson. While utilizing online coaching, personal training, nutritional consults, and teaching group classes, Andrew became specialized in coaching clients for Weight Loss, Body Composition Transformations, and Strength Performance Goals.

After becoming exposed to Revival Strength through his girlfriend Sarah’s family (long-time clients of the gym), Andrew decided to become a remote client, coached by Brianna Lamb, to better his training and increase knowledge and awareness as a coach when it comes to the online and in-person experience. He was completely inspired by the Revival Strength approach to training and message to the community of long term health and fitness.  He felt a gravitational pull to become a part of that movement and unique opportunity coaches have to connect to their clients on a deeper level.


B.S. in Exercise Science – Florida State University
ACSM Certified Personal Trainer
Kettle Bell Athletics Level 1 Certified
Trigger Point Therapy Level 1 Certified
Kilo Strength Society Online Program Design
CPR/AED Certified American Red Cross



Marketing Director, Partner

Satya has an extensive background in web development, online programs, and marketing, and has worked for Charles Schwab, Red Hat, and Nokia among others, forming her own freelance business in 2003. Seeking a way to combine work with her personal passion for fitness, she joined Revival Strength in 2016 to co-develop and market Awaken Training Series, and has evolved her role to support marketing, program development, and operations for Revival Strength as well as Functional Bodybuilding. Satya has two sons and holds a 4th degree black belt in kung fu.


Administrative Assistant

Photo & bio coming soon.