Holotropic breathwork is a therapeutic breathing practice that many say improves their life and brings them a natural "high".
The spirituality and wellness industries had to adapt to a world in crisis as anxious people flocked to free or cheap services.
In an age of anxiety, wellness trends are booming – could isolation tanks and gong baths hold an answer?
John Lennon swore by them. Do the drug-free mental and breathwork exercises in "Mind Games" hold up?