Get fit with science-backed interval training—no gym required.
Intensity makes interval training simple and effective. Whether you're walking around the block, running your first 5K, cycling to work, or doing bodyweight exercises at home, we'll guide you through proven workouts that get results in less time.
Choose from 40+ ready-to-go workouts or create your own. Just press start and let the app coach you with voice cues, countdown beeps, and visual feedback.
WHAT YOU GET:
• 40+ Ready-to-Go Workouts – From beginner-friendly walks to advanced HIIT, running, cycling, rowing, and strength training
• Voice Coaching – Real-time announcements guide you through every interval in 22 languages
• Apple Watch Support – Full app on your wrist with heart rate tracking and haptic feedback
• Apple Health Integration – Automatically records calories, distance, steps, and heart rate
• Live Activity Widget – See your workout progress on your lock screen
• Create Custom Workouts – Build unlimited interval sequences that match your fitness level
• Workout History – Track every session with detailed metrics
• Smart Audio – Countdown beeps and cues that automatically lower your music
• Background Mode – Keep your screen off while the workout runs
• Cloud Sync – Your workouts and settings stay in sync across all your devices
• Export to Apple Workouts – One-tap transfer to Apple's native Workout app
WORKOUTS FOR EVERYONE:
Beginners: Start with gentle intervals like Couch-Lite or Japanese Interval Walking
Runners: Build speed with Yasso 800s, 10-20-30, or Norwegian 4×4
Cyclists: Boost power with Seiler 4×8 or Little 60/75
HIIT Fans: Crush Tabata, Scientific 7-Minute, or Sprint 8
Anywhere Training: Rowing, boxing rounds, stair climbs, jump rope, and more
Every workout is based on exercise science research. No guesswork—just proven protocols that deliver results.
Download Intensity and discover how effective your workouts can be.
EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula
Privacy Policy: https://velocityraptor.co/app-privacy
I enjoy the amount of detail that I am able to incorporate in workouts though this app. Great directions and ease of use on app. However, it could be more user friendly on the watch by:-Being able to save workouts -being able to choose workouts-having a watch face icon, accessible from a main screen
Makes workouts easy + quick
Jsbicisnbdjciofmdn
I LOVE working out and forming my own training sessions, but most of the times it’s a huge hassle to set up a timer and stay motivated. This HIIT timer is easy to set up and customize, and allows you to listen to music while working out. The app tells you what move is next, how much longer you have, and counts down the last five seconds of each move- life saver!!! It also tracks what days you workout/don’t (rest days rockkk) and gives you several workouts for FREE when you download. No reason not to!! Plus workouts are super fast but leaves you with a burn for several days! Highly recommend!!
Highly annoyed
KLHFitness
This used to be my favorite app to train with. I’d use it for clients, classes, and my own training. The past several months it no longer continues to play my music in the background. I’ve always had the same setting on it to allow ‘background’ music to continuously play and every time I open the app, my music stops. After going back to my music app and pressing play again, and going back to the app, the music stops again. I paid for the premium and this is highly disappointing since I switched apps because the the other timer app I used did a similar thing.
Very interesting and unique.
jdcrazy2011
This app is much more fun and interesting than the timer app that comes with the phone. Interval timer talks to you, dings when it counts down to five. And lets you play your music while you’re exercising or doing any other chore that you want to keep track of. It’s overall a very well thought out app!
Bug fixes and stability improvements.
Version 1.0.3
The developer, Velocity Raptor Incorporated, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Privacy practices may vary, for example, based on the features you use or your age. Learn More
The developer indicated that this app supports the following accessibility features. Learn More
Supported Features
VoiceOver
Larger Text
Dark Interface
Differentiate Without Color Alone
Information
Seller
Velocity Raptor Incorporated
Size
43 MB
Category
Health & Fitness
Compatibility
Requires iOS 26.0 or later.
iPhone Requires iOS 26.0 or later.
iPad Requires iPadOS 26.0 or later.
Mac Requires macOS 26.0 or later and a Mac with Apple M1 chip or later.
