The Family

PowerStrength Training Systems was founded in June 2011. West Michigan was in desperate need of place where athletes could commit to a program and know they were maximizing their potential and results. PowerStrength was formed with the sole purpose of providing a facility to create better people through physical performance and training.

Meet The Team

 Mark Ehnis– Founder – Owner

Mark was born and raised in Ada, MI where he attended Forest Hills Nothern High School. His passion for his hometown roots and for developing serious athletes, PowerStrength was opened in 2011. Mark has been working with athletes to enhance their overall athletic performance and lifestyle for the past decade. He is known for his direct, blue-collar mentality and getting the most out of his clients. Mark has influenced thousands of West Michigan athletes of all ages, levels, and athletic backgrounds. He also spent 6-years coaching football at the high school, led high school strength and conditioning programs, is an area speaker, and spent time serving as an adjunct college professor.

Between the times spent on the family farm, competing with his twin brother, and growing up as an active athlete- Mark compiled a passion for leading others to develop better experiences and abilities through strength and conditioning and physical training. Mark is constantly pursuing success and trying to discover better ways to coach, train, develop a unique business, and enhance a team of all-star professionals. He enjoys leading, inspiring, and serving others to guide them towards high-achievement and beyond.

Mark graduated from Cornerstone University with degrees in Exercise Science, Coaching, and Sports Management. He is a Master-Level Certified Physical Performance Specialist (CPPS) and is a Certified Strength and Conditioning Specialist (CSCS) through the National Strength and Conditioning Association.

You can contact Mark through email at Mark.Ehnis@powerstrengthpro.com


Jackie Ehnis – Director of Adult Fitness

Jackie Ehnis, wife of PowerStrength founder Mark Ehnis, is a West Michigan native, graduating from Ravenna High School and earning her Bachelor’s Degree from Aquinas College. Jackie excelled on the basketball court as a high school and college athlete, earning a full scholarship to play basketball at Aquinas where she was honored as a two-time All American.

After college, Jackie followed her passion for training and became a Certified Personal Trainer and Certified Strength and Conditioning Specialist.  She gained valuable experience personal training in the area before moving to San Diego, CA to work as a civilian contractor in the Navy. In this role,  Jackie provided fitness assessments, programming, and coaching to Senior Naval Officers.   

In 2014, Jackie received her Masters in Public Health, with an emphasis on behavior change and has since worked in multiple capacities in the Public Health field, including personal training, employee wellness, lifestyle coaching, and school health.

Jackie is passionate about helping adult clients reach their goals through individualized training programs and behavioral coaching. She is passionate about working with adult clients that are focused on fat loss, improving body composition and strength, and improving quality of life. Jackie provides large-and-small group training sessions and also offers one-on-one sessions for clients that want more personalized coaching to meet their fitness and lifestyle goals. She is currently a Certified Lifestyle Coach and is certified to administer the Functional Movement Screen.

You can contact Jackie through email at Jackie@powerstrengthpro.com


Cameron White – General Manager – Director of Youth Development

Cameron is a Grand Rapids native and graduated from Forest Hills Central in 2008. He lettered in football, basketball, and baseball before accepting a football scholarship from Hillsdale College. He played at Hillsdale College from 2008 until 2012 and was a captain his senior year. While at Hillsdale, Cam was an All-Conference and All-American selection in his junior and senior seasons. During the middle of his senior season Cam tore his ACL, but still received All-Conference and All-American honors. Cameron graduated with a degree in Marketing/Management.

After graduation Cam came back to PSTS to pursue his dream of playing in the NFL. During that time Mark molded him into a PSTS Coach while preparing Cam for his football combines. Cameron signed with the Indianapolis Colts in 2014 and played with them in the preseason. After his time in Indianapolis, Cam spent some time playing in the developmental FXFL and returned from playing professionally in Turkey in June of 2016.

Cameron is CPPS Certified and ACE Certified and works mostly with the Little Beasts (Middle School Program). However, all of our coaches can work with any of our athletes. Cam’s ability to connect with young athletes really helps develop a foundation for safe, effective, and fun training for youth athletes.

You can contact Cam through email at Cameron@powerstrengthpro.com


Skyler Davis – Director of Training and Programming, Lead Performance Specialist

Skyler is from Napoleon, Ohio and attended Hillsdale College with a focus on biochemistry and exercise science while playing football for 4 years. He first came to PowerStrength during one of his summers to perform an extensive internship and train with our college athlete group. 

In 2014, Skyler moved to Grand Rapids to begin at PowerStrength full-time. Since then, he developed within the team and now humbly serves as our Director of Programming and Training. He also coordinates our Internship Program and Nutrition Program. He is certified as a Certified Physical Preparation Specialist (CPPS), Precision Nutrition Level 1 Coach (PNL1), Certified Speed and Agility Coach (CSAC), and Certified Group Fitness Instructor (ACE GFI). While he recognizes certifications and letters have value, Skyler takes it as his mission to use self-directed learning to continuously bring the newest, most effective methods to all of our clients and coaches.

Skyler was never massively talented as an athlete but always prided himself on his work. Unfortunately, his athletic career was cut short by a serious hip and back injury. He now brings his attention to detail and work ethic to learning and coaching so that our clients always get the most out of the work they put in and they can control the controllables.

You can contact Skyler through e-mail at  Skyler@powerstrengthpro.com


Brian Paulsen – Lead Performance Specialist

Brian has a strong accountability to results and will do whatever he can to help others succeed. He is very passionate about helping all clients achieve whatever goals they may have, whether it is getting stronger and faster, reducing pain, losing body fat, or returning from injury.

Brian graduated from Chelsea High School where he lettered in Football, Basketball, and Baseball. Brian went on to play football at Albion College before graduating with a Bachelor’s degree in Exercise Physiology from Grand Valley State University. Brian began at PowerStrength through their internship process and earned a coaching position until he graduated. Since then, Brian has made a few stops as he went on to be a Sports Performance Coach for Georgetown University athletics, and in the NFL with the Baltimore Ravens, prior to returning home to become a Lead Performance Specialist at PowerStrength.

Brian is certified through the NSCA as a Certified Strength and Conditioning Specialist (CSCS), he is a Certified Physical Preparation Specialist (CPPS), along with being a certified Sports Performance Coach through USA Weightlifting (USAW) and Eleiko. Lastly, Brian is a certified Fascial Stretch Therapist (FST) through the Stretch to Win Institute.

You can contact Brian through e-mail at Brian@powerstrengthpro.com


Stefan Stasiulewicz – Performance Specialist

Stefan grew up in Grand Rapids, Michigan where he attended Forest Hills Northern High school. He received varsity letters in football, rugby, and wrestling. Stefan has been an athlete at PowerStrength since the very beginning – supplying him with a unique outlook on training and coaching environment. Stefan has done it all at PowerStrength and it shows in his ability to coach, connect, and energize any clientele he is serving. He is a certified personal trainer through CPPS, ACE, and is completing his Bachelor’s Degree in Exercise Science. Stefan is very passionate about helping athletes and adults attain their goals and live awesome lives.

You can contact Stefan through e-mail at stefan@powerstrengthpro.com


Stephan Cress– Performance Specialist

Stephan is from Grand Rapids, Michigan and attended Connecticut College. He graduated with a degree in biochemistry while playing water polo for 4 years. He was a 2-time All-American and a captain his senior year. He first came to PowerStrength during his Junior year of High School. He loved every moment and has been a part of PowerStrength ever since. He is certified as a Certified Physical Preparation Specialist (CPPS), Precision Nutrition Level 1 Coach (PNL1) and Certified Group Fitness Instructor (ACE GFI). Stephan loves working with a wide variety of clientele, consisting of youth, high school, college and adults. He aims to connect with each person that he comes in contact with and leave them with a positive experience.

You can contact Steve through e-mail at steve@powerstrengthpro.com


Jack Collins– Performance Specialist

Jack loves working with people from all different training backgrounds, helping them find a suitable plan for them, and leading them to achieve their personal goals.  Jack is Grand Rapids, Michigan where he attended NorthPointe Christian High School. He played football in high school and this led him to PowerStrength where he became a regular in the gym. Despite multiple injury setbacks, Jack persevered to play in college for national football powerhouse, Mount Union, for all four years. He received his Bachelor’s Degree in Exercise Science at Mount Union and gathered thousands of hours of hands-on coaching experience at numerous training facilities around the country – including an extensive internship at PowerStrength. Jack is certified through ACE, the NSCA, and pursuing his level 1 nutrition coach certification through Precision Nutrition.

You can contact Jack through email at Jack@powerstrengthpro.com


Jessica Payne– Performance Specialist

Jessica graduated in 1993 from Mt. Pleasant High School and earned her Bachelor’s degree  from Grand Valley State in 1997. Upon graduation, Jess was hired by the Grand Rapids Police Department and subsequently attended the Police Academy at Oakland Community College.  Spending nearly 12 years with the PD, she held a variety of positions and additional duties.  Jessica worked patrol as a police officer and a patrol supervisor. She also spent time in the Internal Affairs Unit as an Investigator.  While at the PD, Jess was a Field Training Officer, Use of Force instructor, a member of the Critical Incident Stress Management Team and a First Aid/CPR Instructor trainer.  She also earned a nominee for Police Officer of the Year. Looking to spend more time with family, Jess left the PD in January of 2010. Within three years of leaving the PD, she had earned a Master’s Degree in Family Life Education from Western Michigan, and her personal trainer certification from the National Strength and Conditioning Association. Jessica has been a certified personal trainer since June 2011 and is also TRX Level 1 certified. Having spent 12 years as a police officer, Jessica feels an incredible responsibility to her community.  She currently serves as Vice President on the Executive Board for Safe Haven Ministries; a faith-based non-profit entity whose mission is to end domestic violence.  When not in the gym, volunteering, or spending time with her family and 2 kids, Jess enjoys traveling, cooking, reading, and gardening.

You can contact Jessica through email at Jessica@powerstrengthpro.com


Karissa Kemme– Performance Specialist

Karissa is a West Michigan native, who graduated from Allendale High School and earned her Bachelor’s Degree in Exercise Science from Grand Valley State. After previously serving as an EMT, Karissa made the switch to a more preventive side of health where she could focus more on training, fitness and helping those around her feel their best. She is a certified personal trainer and continues to practice the growth mindset when it comes to health and fitness. Karissa has gained valuable coaching experience after working in several gyms in West Michigan and has had the opportunity to serve a variety of clientele. Outside of PowerStrength, Karissa can be found soaking up the pure Michigan outdoors, cooking, or gaming.

You can contact Karissa through email at Karissa@powerstrengthpro.com