This image shows the Boxbollen Boxing Reflex Ball, a gamified physical fitness tool designed to improve hand-eye coordination, reflexes, and body awareness. 
Equipment Overview
Adjustable Headband: A neoprene strap with a Velcro closure.
Tethered Ball: A lightweight, textured red foam ball attached via an elastic cord.
App License Card: Gives access to the interactive companion smartphone application. 
How to Set It Up
Adjust the Cord Length: Stand upright with the headband on. The ball should naturally hang just below your navel or belly button.
Shorten the Cord: If the string is too long, wrap it around the sides of the headband until the ball is at the correct time.
How to Play (Beginner Strategy)
Start Small: Gently toss the ball up and hit it forward and slightly downward with a soft fist.
Let It Come to You: Avoid chasing the ball wildly. Stand still and aim for light, rhythmic taps.
The First Milestone: Focus entirely on getting 10 consecutive hits in a row before trying to punch faster.
Using the Boxbollen App
The companion app turns training into a video game by tracking your success: 
Tracking Hits: Position your phone in front of you with the screen facing you. The app utilizes your phone's microphone and AI to listen for and count your hits automatically.
TV Play: You can use screen-mirroring from your phone to a modern smart TV to display the games on a larger screen.
Global Competitions: The app features a live global leaderboard where players can compete in timed challenges (like most hits in 10 seconds).