But Take That star should be able to do charity trek
The 38-year-old has had scans at the Olympic Medical Institute in west London.
A statement on the group’s website reads: ‘[Due to a] hectic training schedule… the muscles in Gary Barlow‘s back have gone into spasm.’
It adds that the singer has been ‘treated appropriately’ and should be able to complete the charity trek.
Chris Moyles, 34, Alesha Dixon, 30, Denise Van Outen, 34, Fearne Cotton, 27, Cheryl Cole, 25, are also taking part in the event.