Who We Are
Creating a fun and exciting environment that increases mobility, flexibility, strength, and endurance!
Who We Are
Creating a fun and exciting environment that
increases mobility, flexibility, strength, and
endurance!
About Me
Brent Miller
B.A. Fitness Studies
The proclaimed 'Fitness Grandpa'
Sleep by 7 might be his thing, but don’t let that fool you—Brent brings the energy every single day!
With over 15 years of experience in Appleton, Menasha, Neenah, and Wisconsin’s Fox Cities area, Brent has seen it all. From weight loss to muscle building to performance goals, he draws on his deep expertise to help clients succeed.
He graduated from Lakeland College (now Lakeland University) in 2009 with a B.A. in Fitness Studies.
Brent’s mission? To make the TNT Fitness Team and the Fox Cities better, one day at a time.
'It’s not always easy, but once you feel how good - good reall is, you won’t turn back.' - Brent"
About Me
Sam Oswald
NSCA CPT
Fitness is his passion!
Sam found the weight room at a young age and used it to improve his athletic performance and build his confidence.
He lives and loves fitness and it's easy to see that puts in the time and effort to lead from the front. Sam is a student and practices what he preaches for training and nutrition.
Sam will give you a little push when you need it most, but will also be there to slow things down when that is necessary too.
"These sessions are going to be fire." - Sam Oswald
About Me
Luke Mantel
NASM CPT
Did you say RUN?!
As of now, Luke has maintained an 850-day streak of running at least one mile—and that’s how it all began.
Like many of us, Luke once felt stuck, unsure of what came next. Then he stepped into the weight room, and everything clicked—this was his calling.
Now, he’s dedicated to helping people discover the confidence and energy that strength training brings.
Luke gets it—he’s empathetic to your struggles, passionate about your wins, and ready to give you that nudge when you need it most.
'I felt it in my bones: this is what I’m meant to do.' - Luke Mantel
testimonial videos
Lea
Fit, Healthy, and Strong!
Darin
I Feel Stronger At 53, Than I Did At Age 50, Age 48, and Age 45!
Bob
Gain Strength and Become Resilient!
Mary
She Lost 50 Pounds and Keeps Moving Forward!
A Few Of Our Most Successful Clients
Their first step was to take action, and now you can do it too!
“I have been a member of TNT Fitness for over a year now. In my opinion, TNT is the best fitness center in the area. The trainers are knowledgeable and will encourage you to reach your full potential. TNT is more than just a gym, it’s community of people who share a passion for health and fitness and who are there to support and encourage each other along the way. I highly recommend TNT Fitness to anyone wanting to start or continue their fitness journey.”
“TNT is a great gym for all levels of fitness. I came in nervous that I would not be able to complete a workout without leaving feeling empowered. The trainers are wonderful and know how to modify where needed, but also push you to work harder. I love the variety in the workouts and the comradery with the other members of the gym.”
“Joining TNT fitness was the best decision I ever could have made, my only regret is that i didn’t join sooner. Each of the coaches go out of their way to guide/support you in your fitness journey on a path to success! They truly care and get to know YOU and your needs and work with you to be able to help you achieve your goals. If you’re looking for an AMAZING community to join TNT Fitness is the place!”
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