kMeter Manual: App Usage

An overview of the functions of the kMeter App.


Connect your device by pushing the green connect button on the start screen, the device needs Bluetooth to be enabled (for devices purchased before May 2018, the kMeter must be manually turned on).

iOS only: If multiple active kMeters within reach you will get a choice which one to connect to.

Choose Set up to change settings, results to see previously saved data in the built-in database. Press start to manually start data acquisition.

In iOS you can project the screen to a TV connected to an Apple TV by using screen mirroring. The app landscape mode of the kMeter will be presented on the TV screen.


Connect: Connect to kMeter, see which kMeter you are connected to or disconnect.

User: Select user or add new together with name, weight, height, birth date, gender, team and club. Weight in kgs or lbs is used to get relative peak power in set summary (peak power in W / kg or W / lbs) and BMI.

iOS only: You can set up a .csv file with all your users and shared it via email, iCloud or Google Drive. Open the file in your iOS unit and choose “Copy to Exxentric” to import the users. Download templates and instructions here. You can also delete users by selecting the specific user and press “delete”.

Inertia: Push the button to select the correct amount of wheels to pick the corresponding inertia. Inertia is also presented in numerical values in setup and on the flywheel in the centre of the screen. At the start screen, press the inertia value to go straight into inertia settings.

Stop at: here you can select the endpoint of the set in different ways.

  • Pre-defined number of reps
  • Pre-defined time.
  • Absolute power threshold to stay above.
  • Stop at a certain drop-off from max power.

Pre reps: extra reps before the set and the data collections starts. These reps are used for acceleration and will be discarded in the workout summary. Iso mode means 0 pre-reps, usable if you want to go from a ISO-hold into dynamic action (pinch-release). 

Voice: Mute or choose auditive feedback with rep count, average, peak power, average speed or power limits. Power limits allow you to set a range and kMeter will give vocal and graphic feedback if you go outside of this range.

Auto start: kMeter Module and App senses rotation and stops by itself. Acquisition of data starts and begins without any interaction for the user on the screen.

Time display: Choose between clock or timer in the screen between sets. The timer is reset after every set and is used for timing set rest.

Display results: Choose which metrics you want to see in the summary after a completed set. All metrics are saved whether you decide to have them displayed or not, so this will not affect the data saved, only the presentation.

Workout list: Add or remove drills, for example, if you do a variation of a drill you can assign it a specific name and it will appear in the drop-down list when you select exercises when saving. You can also change the order. Recommended is that you put your most common exercises at the top since they then will appear at the top of the drop-down list when saving and that will save you time.

Research mode: if activated this will convert the ‘share’ button in the set summary into a ‘send’ button. Instead of saving a screen dump of the summary you will send a -csv file with raw data from the set. It’s recommended that this setting is turned off.

During acquisition

Graph shows pre-reps (faded) and training reps with average or peak power values or average force for every rep. In peak power mode you get one column for CON phase (light brown) and one for ECC phase (dark brown) to track ECC overload rep by rep. With power limits activated you will see a grey area indicating that pre-set target range.Foto 2015-11-09 10 36 46

Use ‘stop’ to manually stop data acquisition.

The rotation of the flywheel indicates motion but doesn’t correlate to actual rotation speed.


Workout summary

You can select which numbers to display and hide in setup > display results 


Average power = average power for all reps in set (except pre-reps) both CON and ECC phase.

CONC peak power = average CON peak power during all CON phases in the set (To see CON peak for every individual rep look at the graph).

ECC peak power = average ECC peak power during all ECC phases in the set (To see ECC peak for every individual rep look at the graph).Foto 2016-05-09 12 00 09

Peak overload % = ECC peak power / CON peak power

Relative peak power = W / kg or W / lbs body weight

Average force = Approximated force based on calculations from ROM and power. Not to be used between users or exercises but works as an approximation for certain exercises by a certain user.


range of motion = how long the average rep was (in centimetres) over the whole set.

Average speed = average rep speed in m/s over the whole set.



Generated energy = energy put into the flywheel in kJ (not your expenditure).

Repetitions = number of reps performed.

Workout time = duration of the set.

Inertia = the inertia you set in setup.

VAS = Visual analogue scale. User input after workout summary in the display. Stored in the database with all other data. Can be used to track effort or pain for example.

Press arrows up/down beside graph to switch view between average power, peak power and estimated force values.



You can press ‘share’ to save a screen dump of the summary to your camera roll. If ‘research mode’ is activated this button will say ‘send’ and you will then send raw data from the set in a .csv file.

You can edit the data, ie discard certain reps remove them from the summary by pressing ‘edit’.

Save the data by pressing ‘save’ and you will be able to change user, add exercise, RPE/VAS, comment.

Your saved data is accessible via ‘Results’ from the start screen. Here you can edit the settings if you want to change user/exercise, RPE or comment. You can also filter your sets on a specific user and share the data by selecting the sets and press send. Data will then be compiled in a .csv file ready for email export. Open it up in Excel.


Understanding the feedback

kMeter iconThe kMeter app receives rotational data from the kMeter via bluetooth. The power is calculated and presented as average power per rep and peak power in CON and ECC to determine eccentric overload.

The power data is exact and consistent. Number of reps, rep time and energy expenditure are also exact while vertical motion (ROM) and force are more complicated calculation with more variables and should be considered as an approximation.

ROM and force data should not be used to compare different athletes or exercises but to be used in the same athlete and exercise. It can give information of progress overtime or changes with different inertial loading.

If you still want a kMeter walkthrough sign up for our free online kMeter intro course here.


Testing your power

The kMeter provides accurate power monitoring, but to get data comparable between users and over time, a standardized test protocol is necessary. The kBox Power Test defines in detail how the exercise should be performed and documented. Read more.

Go back to the kMeter Manual.


kBox4 Active

The Newest model, the kBox4 Active is built on proven, reliable technology. The perfect tool in strength and rehabilitation at our lowest price point.

  • Newest Model
  • Holds 1-2 Flywheels
  • kMeter Compatible
  • Weighs 15 kg
  • Starting at €1 410 / $1 585
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kBox4 Lite

Often chosen for its smaller foot-print, the kBox4 Lite model is of a lower weight, portability and not to mention its competitive entry cost level.

  • Portability
  • Holds 1-4 Flywheels
  • Built in kMeter
  • Weighs 9.5 kg
  • Starting at €2 300 / $2 575
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kBox4 Pro

The kBox4 Pro is our premium model with the greatest versatility. It’s ideal for sports teams and larger training and physiotherapy facilities.

  • Largest Floor Space
  • Holds 1-4 Flywheels
  • Built in kMeter
  • Weighs 15.5 kg
  • Starting at €2 990 / $3 345
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The kPulley is the ideal horizontal solution for improving strength by offering flywheel training for rotational and pull exercises.

  • Horizontal Model
  • Holds 1-2 Flywheels
  • Built in kMeter
  • Easy to assemble
  • Starting at €1 750 / $1 955
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