Fjell

Press kit

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Fjell (say "fyell") is Norwegian for mountain. After a session, the recap graph shows the four work intervals as four peaks.

In one line

Fjell is an iPhone and Apple Watch app for the Norwegian 4x4 interval workout, steered by your heart rate.

In 50 words

Fjell is an iPhone app for the Norwegian 4x4 interval workout: four rounds of 4 min at 90 to 95 % of max heart rate, with 3 min of easy recovery in between. Apple Watch measures your heart rate. Voice cues play over your music, even with the screen locked.

In 120 words

Fjell is an iPhone app for the Norwegian 4x4 interval workout: four rounds of 4 min at 90 to 95 % of max heart rate, with 3 min of easy recovery in between. Apple Watch measures your heart rate, and Fjell shows whether you are below, in or above the zone. A halfway check, Fjell's own rule of thumb, shows if you are on pace for the zone. Voice cues play over your music, and a Live Activity shows the workout on the lock screen. After each session, a graph shows your four peaks and time in zone. Recovery shows overnight heart rate variability against your own baseline. No account. Your data stays on your iPhone and in Apple Health.

Key facts

Name
Fjell, said "fyell": Norwegian for mountain
What it is
An iPhone app with an Apple Watch app and a lock-screen Live Activity, for the Norwegian 4x4 interval workout
Category
Health & Fitness
Price
7 days free for new subscribers, then 2.99 a month or 19.99 a year (in USD, CAD and EUR; local prices elsewhere)
Works with
iPhone. Apple Watch is optional and adds heart rate. See the requirements.
Privacy
No account, no ads, no tracking. Data stays on the iPhone and in Apple Health.
Developer
David van Rooij
Contact
hello@fjell4x4.com

Availability

Coming soon to the App Store, for iPhone and Apple Watch.

Downloads

Screens

Previews only. For full-size images, use the screenshot download above.

Fjell's workout screen during a work interval, with heart rate in the target zone.
During a round
Fjell's recap graph of a finished session, with four work peaks.
The recap
The iPhone lock screen with Fjell's Live Activity during a workout.
The lock screen

Brand notes

  • Paper#F3F2EE
  • Ink#1A1917
  • Ember#EE4D38

Ember is kept for effort: work intervals, hearts and the × in the mark.

The typeface is Geist, by Vercel, under the SIL Open Font License.

The Fjell mark

The mark is "4×4" with the × in ember. Please don't recolour the mark. In running text, write 4x4 with a plain x.