Foster The People frontman Mark Foster has offered a photographer pal a weightloss challenge - if he loses 80 pounds in eight months, the Pumped Up Kicks singer will hand him $20,000 (£12,500). Andy Barron has been touring the world with the band and Foster has now offered his friend a little cash motivation to shed the bulk. The challenge began on 1 September (12) and Barron has agreed to update fans about his progress on his blog.