Stop Racing Through Reps. Start Building Real Muscle.
CENTRIC turns your Apple Watch and iPhone into the ultimate time under tension coach, helping you control every phase of your lift for maximum muscle growth.
FAQs
What is time under tension and why does it matter?
Time under tension (TUT) is how long your muscles work during each rep. Instead of racing through 10 quick reps, TUT training keeps your muscles working longer - like holding a 3-second lowering phase and 2-second pause. This extended muscle work triggers more growth and strength gains than fast, ego-driven reps.
How is CENTRIC different from just using a regular timer?
CENTRIC breaks down each rep into four distinct phases: lifting (concentric), holding, lowering (eccentric), and resting. You'll see a dynamic progress bar showing exactly which phase you're in, plus get audio and haptic feedback through your Apple Watch and iPhone. No more guessing or counting in your head while a generic timer ticks away.
I'm new to time under tension training. Will this work for beginners?
Absolutely. CENTRIC includes preset TUT protocols for different goals - whether you want to build muscle, increase strength, or improve endurance. Start with our beginner-friendly templates, then create custom timing as you advance. The app guides you through each phase so you can focus on perfect form instead of counting seconds.
Does CENTRIC work with any exercise?
Yes! Whether you're doing bench press, squats, bicep curls, or any other lifting movement, CENTRIC's timing works universally. The app doesn't track specific exercises - it simply helps you control the tempo of whatever lift you're performing.
What if someone tries to take my machine while I'm resting between sets?
We've got you covered with our "Bathroom Break" feature - a hilarious screen that politely tells other gym-goers your machine is occupied. It's the kind of smart, practical feature that shows we actually understand gym life.
Do I need an Apple Watch to use CENTRIC?
CENTRIC is designed for both the Apple Watch + iPhone. So even if you don't have an Apple Watch, you still can better count your reps with CENTRIC.
Will this actually help me build more muscle?
Research consistently shows that controlling rep tempo - especially the lowering (eccentric) phase - creates more muscle damage and growth stimulus than fast reps. By forcing your muscles to work longer under load, you're maximizing each rep's muscle-building potential instead of just moving weight from point A to point B.
ABOUT US
Building Better Workouts Through Better Technology
Hey! I’m Steven Bell, the Founder and CEO of PROTECHT + CENTRIC.
CENTRIC was born from a simple frustration: why does gym technology focus on everything except the actual lifting?
As the founder of both CENTRIC and PROTECHT, I've spent years combining technology with serious training. During my own weight loss journey, I relied on my Apple Watch to track everything - heart rate, calories, steps, sleep. But when it came to the most important part of my workouts - the actual reps - I was on my own.
I watched lifters (including myself) rush through sets, let ego drive the weight selection, and miss out on the muscle-building benefits that come from controlled, intentional reps. Meanwhile, our wrists held incredibly sophisticated technology that could solve this problem.
CENTRIC represents our mission to bring meaningful innovation to the gym floor. Not flashy features or social media integration - just tools that make your workouts more effective. Whether it's our time under tension app or the Apple Watch-compatible lifting gear at PROTECHT, we're focused on using technology to build better lifters.
Every feature in CENTRIC comes from real gym experience. The bathroom break screen? Because we've all been there. The phase-by-phase breakdown? Because counting seconds while lifting heavy is impossible. The haptic feedback? Because your hands should be on the bar, not your phone.
We're not trying to reinvent fitness - we're just making it smarter, one rep at a time.
MAXIMIZE YOUR TECH-FIRST FITNESS
Ready to take your Apple Watch workouts to the next level?
CENTRIC handles the timing, but the right gear makes all the difference.
Our smartwatch-compatible lifting gear at PROTECHT are designed by the same team that built CENTRIC - because we believe your entire workout should work as seamlessly as your technology.