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Mary's Training Center


Meet our team of dedicated personal trainers, each equipped with a wealth of expertise and a passion for guiding clients towards their fitness goals. With a diverse range of specialties and backgrounds, our trainers bring a personalized touch to every session, ensuring that each individual receives tailored guidance and support on their fitness journey. From strength training to weight loss, rehabilitation to sports-specific conditioning, our team is committed to empowering clients to surpass their limits and achieve sustainable results. Get ready to embark on a transformative fitness experience with our esteemed personal training staff – your partners in health and wellness.

Mary Schaefer Driscoll

Owner, Certified Personal Trainer, and Nutrition Coach

Mary is a 2000 graduate of Hershey High School. She graduated from Penn State University in 2004, where she played Field Hockey and studied Kinesiology.  Mary has been a certified personal trainer since 2004, and has helped thousands of individuals meet their fitness goals!  She is also an NCAA and International Field Hockey Umpire.  She opened Mary’s Health and Fitness in 2015, and enjoys training individuals at all fitness levels!


Strength and Conditioning Director

Adam Marso is a Harrisburg native who graduated from Susquehanna Township High School in 2011. While at STHS, he was a 4 year varsity Ice Hockey player, and a 3 year varsity Baseball player. He was selected to the CPIHL all star team 3 times and was also a member of the 1st team Mid Penn Conference baseball all stars his senior year.

After high school he went on to study Kinesiology at Penn State University, where his Strength and Conditioning Career began. While at Penn State he interned with the Sport Performance department where he worked mainly with Boys Lacrosse, Girls Soccer, Baseball, and Rugby. Then he took an internship at the University of Pittsburgh before accepting a Graduate Assistant Strength and Conditioning position at Nicholls State university (Thibodaux, LA) where he spent two years designing and implementing programs for Women’s Basketball, Softball, Developmental Football, and Tennis teams, while earning his Master’s in Educational Leadership.

In between his two years there, he spent a Summer at the University of Denver assisting their Sport Performance team with off season training for  Basketball, Lacrosse, Soccer, Volleyball and implementing programs for NHL/AHL/ECHL. After receiving his master’s in Education, he went to Jacksonville, FL to work with the University of North Florida. He was an Assistant Strength and Conditioning Coach there for 4 months before taking a job with the Pittsburgh Pirates Organization as a Minor League Strength and Conditioning Coach. While with the Pirates, he spent 2 years in the Dominican Republic working with the academy teams, and moved up to Low A Greensboro before the 2020 shutdown.

The past 3 years have been spent in Philadelphia where he was an Athletic Director at Bonner & Prendie Catholic High School (Drexel Hill, PA). While there, he oversaw all aspects of each sports team, as well as continuing to coach in the weight room as well. Adam is extremely excited to continue his career at MTC and coach the best athletes in the state!!

Katie Kosovac

MTC Team Lead, Certified Personal Trainer

Katie is a Certified Personal Trainer through the American Council of Exercise (ACE). She was a two-sport collegiate athlete playing both soccer and basketball for Penn State Harrisburg where she earned a B.S. in Kinesiology. In her free time, she enjoys spending time with my family and friends.

Rhyan Socash

Certified Personal Trainer

Rhyan graduated from Red Land High School in 2018 then went on to complete her degree in Kinesiology at Penn State Harrisburg in 2022. Her professional journey began with an internship at Mary’s Health and Fitness, where she gained valuable experience. Rhyan furthered her expertise by working at various local fitness centers. Throughout her collegiate years she played soccer and despite facing the challenges of three ACL injuries, she remained resilient. These experiences sparked her passion for injury prevention and rehabilitation. Rhyan is driven by the desire to make a positive impact, drawing from her own journey in overcoming challenges in the realms of fitness and injury management.

Stefanie Cassel

Certified Personal Trainer

Stefanie is from Ontario, Canada. She graduated from Edinboro University in 2021 with her B.S. in Exercise Science and is a recent graduate of the University of New Mexico with her M.S. in Physical Education. Stefanie was a collegiate athlete, earning countless recognitions including x6 All American and 15 PSAC championship titles. She is currently training for the 2024 Olympic Trials.

Matt Yansick

Certified Personal Trainer

Matt is originally from New Jersey and found a love for resistance training and fitness through high school sports.  He recently graduated with his Bachelor of Science in Exercise Science from Lebanon Valley College and is finishing his Doctor of Physical Therapy degree at LVC. He is excited to work with clients to help them crush their individual goals and maximize their health!