“You’ve achieved 40 seconds of uninterrupted focus.”

Apparently, this is cause for celebration. For the past 10 minutes, I have been staring at my phone, trying to move a digital ball up a hill using nothing but the power of my mind. The Mendi headset I am wearing is analysing my brain activity and reflecting that back into the game. The more I concentrate, the higher the ball climbs.

This exercise is supposedly working out my mental muscle, just as one might use weights to train physical muscle, ultimately improving my focus and reducing my stress.