Listen to the whole interview with Stig Severinsen
Twenty two minutes - that's how long Stig Severinsen once held his breath underwater.
The four-time world free diving champion has retired from the sport, and now teaches people how to improve their breathing techniques.
He uses his background in biology and yoga to harness the power of breathing - calling it 'breatheology'.
He says controlling your breath can improve everything from high-performance sports to helping people recover from trauma.