The doctor-designed HIIT workout app for iPhoneTrain.Track.Transform.
Doctor-designed high-intensity interval training (HIIT). One advanced workout a day, around 20 minutes, with a pacer, live heart rate and competitors who keep you coming back.
13,000+ workouts completed by Phyzseek members
Your workout is already waiting
The PHYZWOD, Phyzseek's workout of the day, is an advanced, doctor-designed workout on your phone every day. No deciding. Open the app and press READY.
Delivered daily. A new advanced workout every day, designed by a doctor and driven by science.
Programmed for balance. Dr. Ende sets the rotation so your different energy systems are stressed equally. Each one builds a different kind of fitness. Muscle development is balanced across your joints to protect them.
Fits your gear. Each exercise switches to the equipment you own, with an easier version one tap away.
Shown, not just named. Every exercise has a video demo and coaching cues.
Miss a day, catch up. The last 12 days stay open.
It worked on the doctor first
Dr. Ende built this method for himself before it was an app.
Motivation, in layers
Willpower runs out. Phyzseek gives you a reason to start, a reason to push and a reason to come back.
Before
Getting you to start.
Someone just trained
When a competitor finishes a workout, you get their result. Nothing gets you moving faster.
No time excuses
Around 20 minutes. Some shorter, some longer, all built to transform you.
A score to beat
Your record, average and last result, shown before you start. Every session is a rematch.
During
Keeping you working hard.
Set your target. Hold the pace.
Set the time or reps you want to beat. The pacer shows where you should be at every moment, so you push from the first rep to the last. Voice cues and a bell keep your eyes off the screen. It works on every format: Tabata, AMRAP, ladders, intervals and timed rounds.
See how hard you're working and stay motivated throughout
Wear a Bluetooth chest strap or broadcasting watch. Your heart rate shows in your zone's color, with percent of max.
After
Bringing you back, again and again.
Know where you stand
Compete head to head: your competitors' results, ranked with yours. Leaderboards for PhyzioLevel, workouts, calories and PhyzTest, by age and gender.
Proof you're improving
Beat your best and the app says so, out loud. Records, trends and PhyzioLevel move when you do.
Doctor-developed. Science-driven.
Hard enough to change your body, structured enough to protect it, and measured every session.
It's the intensity, not the hours
Work hard enough and your muscles make lactate faster than you can clear it. Once blamed as waste, lactate is now known (UC Berkeley research) to be a fuel and a signal that tells your body to adapt. PHYZWODs keep you there long enough for the signal to register.
The signal needs time
Growth-hormone release is greatest when you work above your lactate threshold for at least 10 minutes.
Fuel and messenger
Lactate fuels your mitochondria and, like a hormone, signals muscle to build more of them.
Adaptation is fast
Seven high-intensity sessions in two weeks significantly raised fat burning during exercise.
Less time, similar gains
Short, intense intervals have matched the adaptations of much longer steady workouts.
Sources: Brooks, Cell Metabolism 2018 · Godfrey et al., Sports Medicine 2003 · Talanian et al., J Appl Physiol 2007 · Gibala et al., J Physiol 2006. Individual results vary. Check with your doctor before starting high-intensity training.
Heart-rate zones built on your own max
Zones are set from your own maximum heart rate, and the top zone adjusts to your fitness level. Works with any Bluetooth chest strap or broadcasting watch.
How fast your heart comes back down
The app records how far your heart rate falls 30 seconds, 1 minute and 2 minutes after you finish, and tracks the trend.
Track everything that matters
A built-in fitness tracker: dashboards show your progress, and where you're not improving yet.
One fitness score, tracked over months
Your rank on Intervals, Lactic Loading and Endurance workouts, as a percentile against real athletes. It rises only when you get fitter. Charted alongside intensity, calories, weight and resting heart rate.
Every workout, every attempt
Any workout: your results, heart rate, intensity and calories over time, next to the field.
Runs for your days off
Mile splits, heart-rate graph, recovery and drift (how much your heart rate creeps up at a steady pace). Less drift means a stronger aerobic engine.
Two engines, trained on purpose
PHYZWODs build high-end conditioning: go hard, recover, go hard again. Steady runs on days off build the aerobic engine underneath. Phyzseek tracks both.
Not ready for the PHYZWOD?
Beginner, Intermediate and no-equipment HIIT workouts build you up to it.
No equipment
Bodyweight PHYZWODs for hotel rooms, parks and days away from the gym.
Beginner
Build the base first, with the same pacer and scoring.
Intermediate
A step up in volume and intensity when you're ready.
Build your own
Pick your exercises and build the workout your way.
Built by a doctor who trains
We loved high-intensity training but kept getting hurt. So Dr. Ende designed the program we wanted: intense enough to transform, structured enough to protect your joints and back.
Eric J. Ende, MD, ACSM-CPT
Co-founder · CEO / CFOMedical degree from Mt. Sinai School of Medicine, MBA from NYU Stern, and ACSM personal-trainer certification. Physician and trainer who designed the Phyzseek method, its pacer and its scoring.
Chad P. LaBonte
Co-founder · COOFormer competitive football and lacrosse player with a 25-year business career, who has trained through bodybuilding, HIIT, running and yoga.
Start free. Stay if it works.
Every new member gets 30 days of everything, with no card. After that, one workout a week stays free.
- 30-day full trial, no card
- Then one free workout every week
- Runs, PhyzTest and leaderboards
- Every daily workout and the full catalogue
- Pacer, heart-rate analysis and dashboards
- Cancel any time in your Apple settings
- Everything in Monthly
- About $8.33 a month, 35% less
- Cancel any time in your Apple settings
Subscriptions are purchased through the App Store and renew automatically at the same price until cancelled. Cancel at least 24 hours before the renewal date in your iPhone's Settings → your name → Subscriptions. Available in the United States. See the Terms of Service.
Support and common questions
Questions, problems, or a workout that didn't save? Email us and a real person will reply.
What is Phyzseek?
Phyzseek is a high-intensity interval training (HIIT) app for iPhone, designed by a physician. It sends you one advanced workout a day, paces you through it with a built-in interval timer, tracks your heart rate and progress, and ranks your result against other athletes.
How long are the workouts?
Most take around 20 minutes. Some are shorter and some are longer.
Do I need a gym or equipment?
The daily PHYZWOD uses common gym equipment such as kettlebells, dumbbells, a pull-up bar and a wall ball. There is also a no-equipment PHYZWOD for home and travel, plus Beginner and Intermediate workouts.
What kinds of workouts are there?
Tabata, AMRAP, interval rounds, ladders, 21-15-9, card-deck workouts, mixed reps and cardio intervals, plus runs. You can also build your own workouts with the same timer and pacer.
Is Phyzseek free?
Every new member gets 30 days of everything free, with no card. After that, one workout a week stays free, or you can subscribe for $12.99 a month or $99.99 a year.
Is there an Android version?
Not yet. Phyzseek is available on iPhone.
How do I cancel my subscription?
Subscriptions are managed by Apple. On your iPhone open Settings, tap your name, then Subscriptions, and choose Phyzseek. You can also get there from Settings → Manage Subscription inside the app.
I bought a subscription but the app is locked.
Open Settings in the app and tap Restore Purchases while signed in with the same Apple ID. If that doesn't unlock it, email us with the date of purchase.
Which heart-rate monitors work?
Any chest strap or watch that broadcasts standard Bluetooth heart rate, such as Polar, Garmin (with broadcast on), WHOOP (with Heart Rate Broadcast on) and Fitbit Charge 6 (with sharing on). Apple Health data can be read too.
How do I delete my account?
In the app, open Settings → Delete Account. It removes your account straight away; there's no need to contact us. The Privacy Policy explains what is kept and what is removed.
I forgot my password.
Tap "Forgot password" on the sign-in screen and we'll email you a reset link. Check your spam folder if it doesn't arrive within a few minutes.