4×4
Norwegian interval training, designed for your treadmill.
Sign in with Google
Segment 1 / 9
Ready to Start
10:00
00:00 elapsed
PAUSED
Speed
4.8–5.5
mph
Incline
0.5
%
Start Workout
Pause
Reset
View all segments in Setup
Workout Setup
Configure your profile and generate a personalized 4×4 plan.
Age
Easy pace (mph)
Fitness level
Beginner / restarting
Moderate
Advanced runner
Interval incline (%)
Generate Plan
Max HR
181
bpm
85% Zone
154
bpm
90% Target
163
bpm
95% Ceiling
172
bpm
Next workout:
Hold
Adjusted from history
Workout Plan
Start Workout
Run History
Log your workouts and track your progression.
Post-Workout Diary
Miles
Duration (min)
Avg HR (bpm)
Top speed (mph)
Top incline (%)
Compliance
Completed all intervals
Completed, but barely
Had to lower speed or stop
Felt easier than expected
Effort (
8
/10)
Notes
Save Workout
Clear
Speed
—
Effort
—
Streak
0
0 total
Past Workouts
Refresh
Settings
Manage preferences and connections.
CF
Chris Fago
Sign out
Audio Cues
Beeps and spoken prompts at phase transitions
off
Screen Wake Lock
Prevent screen from dimming during workouts
off
Cloud Sync
Workouts sync to Firebase via your Google account
Connecting…
Timer
Setup
History
Settings
Tap to show nav