By: Adam Cheung, Tracy Achonwa, Daisy Jones, Daphne Bugler, Tom Ward, Daisy Schofield, Phil Hilton, Mike Christensen, Adrian Clark, Jessie Atkinson, Britta O'Boyle
Enhancing your immune system with an insect-killing fungus may seem a bit leftfield but athletes and fitness enthusiasts have properly caught the Cordyceps bug, so we ask some experts why