Fairfield 6370 Pleasant Avenue | Fairfield, OH 45014


(513) 939-2424


Monday 9am to 7pm
Tuesday 9am to 7pm
Wednesday 9am to 7pm
Thursday 9am to 6pm
Friday 9am to 5pm
Saturday 9am to Noon

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Fitness Manager / Certified Personal Trainer

Kiefer Frias Degree and Certifications: B.S. Exercise Science Specialties: Plyometrics, Conditioning, Weight Loss


Kiefer Frias was born and raised in Fostoria, Ohio. He attended Bowling Green State University, where he recieved his Bachelor of Science in Exercise Science. During his time at BGSU he was a fitness coach at Fort Meigs YMCA where he began his experience as a personal trainer. Kiefer also was an intern at the Verizon Health and Wellness Center in Hillard, Ohio where he was responsible for creating wellness programs and leading exercise classes. Kiefer enjoys weight lifting, plyo-metric training, golfing, swimming, playing in adult softball leagues, and attending as many sporting events as possible. His favorite sport teams are the Ohio State Buckeyes, Detroit Tigers, Lions, Red Wings, and Pistons.   "The only person you should try to be better than, is the person you were yesterday."

Membership Benefits

Every Stay Fit 24 location provides:
  • No contracts
  • No cancellation fees
  • No hidden fees
  • Affordable family rates
  • 24 Hour Secure Access
  • Friendly Nationally Certified Personal Trainers
  • Free Exclusive Day1Coaching
  • Free Personal Training Session
  • Free Towel Service
  • Police, Fire, EMT Discounts


Mark Aquino is very passionate about balancing good nutrition, cardiovascular activities, and resistance training. He received his Bachelor’s degree in Dietetics at UC. His main goals are to help his clients meet their goals, gain confidence in the gym, and have a positive view on fitness.

Rachel Alvis is a Cincinnati native, born and raised in Colerain Township. She has played soccer since she was 4 years old, including playing all 4 years in college. This fall she will begin doing individual and team soccer training sessions and she will also be coaching a team in the spring. She is an FC Cincinnati fan and She is a member of The Pride, which is one of the team's support groups. Outside of soccer, she enjoys playing in adult softball leagues, going on hikes, watching Marvel movies, and hanging out with dogs.

Rachel graduated in May 2016 from Hanover College in Indiana and received her Bachelor's degree in Health and Movement Studies. While at Hanover, she gained valuable, hands-on experience training individuals of all ages and all skill levels through personal training and team strength and conditioning. After graduation, she became a certified Exercise Physiologist through the American College of Sports Medicine. Now she is here at Stay Fit 24 to help all of you accomplish your fitness goals!