A 10-second headphone check

Envision Yoga uses audio that alternates between your left ear and your right. That back-and-forth is the engine of the whole practice, and it only works in stereo. Phone speakers and single earbuds flatten it into nothing, and you'd never know what you were missing.

Put on both earbuds or headphones, then press play. You'll hear a soft tone on your left, then on your right.

Curious what the left-right audio actually does? The story is at Where This Comes From.