HIIT 4x4
Interval Training Meter
$4.99
1.07for iPhone, Apple Watch and more
Eastridge Technology
Developer
25.5 MB
Size
Jan 13, 2023
Update Date
Health & Fitness
Category
12+
Age Rating
Age Rating
HIIT 4x4 Screenshots
About HIIT 4x4
HIIT 4x4 is an Apple Watch exercise monitoring app for High Intensity Interval Training (HIIT). The app sequences exercise between high and low intensity intervals. The intensity of the exercise is measured as a percentage of a person's Maximum Heart Rate (MHR).
The HIIT 4x4 intervals are as follows:
- 10 minutes warmup at 60% MHR
- 4 minutes high intensity at 90% MHR
- 3 minutes low intensity at 70% MHR
- repeat high-low intervals 4 times (4 high intensity intervals of 4 minutes each = 4x4).
HIIT 4x4 uses a speedometer type dial to display heart rate. When the arrow is in the green zone then your heart rate is within the interval target. If the heart rate later falls out of the target range, warning chimes are issued until back in range.
Each person's MHR is different, and changes with age. A commonly used formula for MHR is 220 - age in years. A more accurate number can be discovered by using a heart monitor during all out exercise and observing the highest heart rate achieved.
HIIT 4x4 stores your workout history using Apple Health.
HIIT 4x4 is based on the High Intensity Interval Training 4x4 program developed by the Norwegian University of Science and Technology's Cardiac Exercise Group.
The HIIT 4x4 intervals are as follows:
- 10 minutes warmup at 60% MHR
- 4 minutes high intensity at 90% MHR
- 3 minutes low intensity at 70% MHR
- repeat high-low intervals 4 times (4 high intensity intervals of 4 minutes each = 4x4).
HIIT 4x4 uses a speedometer type dial to display heart rate. When the arrow is in the green zone then your heart rate is within the interval target. If the heart rate later falls out of the target range, warning chimes are issued until back in range.
Each person's MHR is different, and changes with age. A commonly used formula for MHR is 220 - age in years. A more accurate number can be discovered by using a heart monitor during all out exercise and observing the highest heart rate achieved.
HIIT 4x4 stores your workout history using Apple Health.
HIIT 4x4 is based on the High Intensity Interval Training 4x4 program developed by the Norwegian University of Science and Technology's Cardiac Exercise Group.
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What's New in the Latest Version 1.07
Last updated on Jan 13, 2023
Old Versions
Added active calories to the workout
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Version History
1.07
Jan 13, 2023
Added active calories to the workout
1.06
Sep 13, 2022
Added Metric switch to Settings
Apple Watch Ultra support
Apple Watch Ultra support
1.05
Mar 22, 2022
Enhanced support for 45 mm watch face
1.04
Dec 11, 2019
Font revision for watchOS 6
1.03
Jul 9, 2019
Improved miles per hour reporting in Cycle Outside.
1.02
Jul 2, 2019
Improved reliability of saving long workouts.
1.01
Jun 26, 2019
Maintenance release.
1.0
Feb 20, 2019
HIIT 4x4 FAQ
Click here to learn how to download HIIT 4x4 in restricted country or region.
Check the following list to see the minimum requirements of HIIT 4x4.
iPhone
Requires iOS 12.0 or later.
Apple Watch
Requires watchOS 5.0 or later.
iPod touch
Requires iOS 12.0 or later.
HIIT 4x4 supports English
