Skip to main content Skip to search Skip to main navigation
Free shipping in Germany at 145€ order
Shipping within 24h
Service-Hotline +49 (0) 6021 62998-100

KFORCE Bubble

KFORCE Bubble

Rehabilitation with biofeedback - made easy with inflatable exercise equipment

KFORCE Bubble is an innovative and versatile tool that converts pressure changes into a force measurement. It can be combined with, for example, inflatable pillows, balls, or fascia rollers.

The KFORCE Bubble is equipped with electronic force transducers and provides real-time biofeedback on your tablet or smartphone via the KFORCE app. You can set strength goals for your patients and motivate them through the rehabilitation process. You can also track your patient's progress with the KFORCE interactive database.

The device allows you to work with deformable or inflatable equipment. The KFORCE Bubble is small, lightweight, and mobile. It can therefore be easily used by ambulatory professionals such as physiotherapists and personal trainers.

Product details:

  • Weight: 0.1 kg
  • Dimensions: 80 x 55 x 25 mm
  • Radio range: up to 20 m
  • Max. Weight: 90 kg
  • Sensitivity: 0.5 kg
  • Accuracy: 0.5 kg
  • Battery: 90 min. with 15 min. recharge time
  • Wireless power transmission: 2.4 GHz band (Bluetooth low power)
  • Scope of delivery: 1 KFORCE Bubble, 1 TOGU Ball, 1 air-filled roller, 1 needle

Minimum smartphone or tablet requirements:

  • Android 5.0+ and iOS 10.0+
  • Bluetooth low power
  • 5'' screen

The free basic app for this product only includes a limited version for assessment and management with patient profiles, standard assessments, and reports in PDF format. To make the most of the great advantage of the devices, we recommend that you get access to the PRO app or the PRO+ app.

0 of 0 reviews

Average rating of 0 out of 5 stars

Leave a review!

Share your experiences with other customers.


Pressure measurement using inflatable devices. One system, many possibilities.

The K-Bubble can be combined with any inflatable equipment fitted with a valve. This pressure measurement in inflatable equipment creates a flexible system with numerous applications:


  • Balls for coordination and stability training
  • Rollers for functional exercises and core control 
  • Other inflatable tools for specific training requirements

This allows a wide variety of tests and training methods to be tailored individually to therapy, training or performance levels.

Real-time biofeedback for rehabilitation and training

The integrated visual biofeedback system displays pressure patterns in real time. This real-time feedback allows users to see immediately how evenly and controlled their movements are.

This improves force modulation, stability and neuromuscular control, and enables targeted management of exercises, particularly in functional rehabilitation. At the same time, the direct feedback boosts patient motivation throughout the course of treatment.

Data-driven force measurement in physiotherapy

Via the accompanying therapy app, the K-Bubble provides objective and reproducible data that enables a clear analysis of movement quality and strength patterns.

This provides physiotherapists and sports scientists with a solid foundation for identifying functional deficits, documenting progress and tailoring training programmes to specific needs.

Vorteile auf einen Blick:

Functional strength testing rather than isolated muscle analysis
One system – maximum versatility
Real-time biofeedback for precise control
Objective data for informed decisions
Versatile for use in therapy and training

Häufig gestellte Fragen:

The Kinvent K-Bubble V3 is a digital force measurement device that detects changes in pressure within inflatable exercise equipment and converts these into a force measurement. It is suitable for functional movement analysis in physiotherapy, rehabilitation and training.

The K-Bubble is connected to an inflatable object (e.g. a ball, roller or cushion). Using built-in sensors, it measures changes in pressure during the exercise and displays these in real time as a force value via biofeedback.

The device is designed for physiotherapists, sports scientists and personal trainers who wish to objectively measure and train functional strength, stability and coordination.

The K-Bubble V3 is the successor to the KFORCE Bubble. It features more sensors for more accurate measurements and a modern design.

The K-Bubble can be used in combination with any inflatable items fitted with a valve, including balls, rollers and other inflatable training aids designed for a variety of training needs.

The real-time visual feedback makes force curves immediately visible during the exercise. Users can see straight away how evenly and controlled their movements are. This improves force modulation, stability and neuromuscular control, and boosts patient motivation.

Yes, the K-Bubble works in conjunction with the Kinvent app. To use it as a therapist, you’ll need a paid subscription (Starter, Premium or Excellence). Only patients can view their readings via the app free of charge.

Yes. As a portable force measurement device, the K-Bubble is small, lightweight and versatile. Whether in a clinical setting, a sports hall or during a home visit.