Donny Day

Founder & C.E.O.

Within the almost 20 years of his experience, Donny has mentored over 100 Fitness Managers, 1000 Personal Trainers and over 40,000 Clients to success in the art of program design, nutrition, and more. He has worked for Bally Total Fitness, LA Fitness, and Just Fitness. With over 15 collective company awards to his name, and multiple large-scale program designs to his name, Donny has helped thousands of members reach their desired fitness level...

Lyndi Day

Part Owner - Co-Instructor & Tempo Specialist

Lyndi Day is the other half to Founder, President, and CEO Donny Day. She is most known for demoing digressions during our At-Home Follow Along workout routines within the Peak Zone Trainer App

Personal Trainer - Millie Matthews

"I’ve been a fitness enthusiast for as long as I can remember and training at PZF for the last 3+ years. When the opportunity arose to become a trainer and take my commitment to life-long health to the next level, it was a quick yes for me. I’m so thankful to be a part of the PZF community and super excited to bring my passion and energy to a few classes each week! Let’s go!!!"

Personal Trainer - Stephen Smith

Stephen is a marathon runner, fitness enthusiast, and nursing student. With years of fitness experience under his belt and an extroverted personality, he leads classes that are helpful, informative and a lot of fun to go to. He brings all he has to every class and you may just find yourself dancing to along to the music in between exercises.

Personal Trainer - Michelle Whittaker

"After being a member for 6 years, I have gained so much knowledge about fitness, and have developed a passion for working out and I am super excited to begin to lead others in their fitness journey! I am excited to bring fitness knowledge to each class and a fresh and fun spin to your workouts. So come workout with your 2022 PZF Games Champ!"

Personal Trainer - Gurdeep Kang

Gurdeep (Deep) has gone from client to Personal Trainer after years of working out a PZF and developing an incredible physique himself. As a talented fitness fanatic, Deep will bring the pump and energy into any class setting. Get ready.

Personal Trainer - Cassie Finken

"I could not be more excited to start this new chapter of my life with you all! Training with PZF these past few years has completely changed my physique and mindset on what my body achieve and look like. PZF has become a huge part of my life and to have this opportunity to become a personal trainer is a dream come true. Can’t wait to kick ass with y’all. Much love, Cassie"

Personal Trainer - Christian Nguyen

"In my first year working at Peak Zone Fitness I have matured physically, mentally and learned so much more than just personal training.

I have gained valuable life experiences about communication skills, being a man, being a great trainer and so much more.

This has been the best job of my life so much so that I look forward to making it a career."

Personal Trainer - Sally Durand

"I’ve always loved working out and racing in triathlons but didn’t know much about weight lifting, until I joined PZF 2 years ago. I love what I have learned about strength training through PZF and I enjoy pushing myself to be better. When I was asked to become a trainer, I was thrilled and am so excited to take my fitness training to a new level! I can’t wait to bring my skills and energy to classes each week and help others meet their fitness goals with fun enthusiasm!!"

Personal Trainer - Tomas Girma


Exercise Science Degree with Texas Tech

What to Know:

Hard working, positive and always optimistic about each client and their results. Train with Tomas if you want to feel great!


"In 3 months at Peak Zone Fitness I lost 45LBs and 13% body fat!"

Personal Trainer - Clay Davis

"I've been an athlete my entire life and a fitness fanatic for many years. I'm also an avid cyclist and outdoor enthusiast. Peak Zone Fitness has been a part of my life for over 7 years and I am excited to take what I have learned over the years and expand my knowledge into helping others in their fitness journey."

Peak Zone Fitness

10531 E. Northwest Hwy, Suite A, Dallas, Texas 75238

(469) 706-3548

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