The Maroon 5 frontman said he decided to ditch the dumbbells in favour of body-contouring yoga because he wanted his body to look more natural.
'Weights made my neck thick, and I would be like, 'I'm turning into a monster!'' he told Details magazine. 'Yoga takes what you have and moulds and sculpts it, which is a much more natural way to look and feel.'
And he freely admitted that his love of the discipline comes from the effect that it has on his body, not because of its relaxing qualities.
'I don't like how people bullsh-t about how yoga is not about vanity,' he said, before conceding that he does use it to come down from the high of performing on stage.
'Playing a show before thousands of people is a highly unnatural state,' he said. 'When I get on the mat and do an hour of yoga before the show, I come out physically relaxed.'