Mark Lewis-Francis says switching coaches has given him a new lease of life ahead of the Commonwealth Games. Lewis-Francis, who won gold in the 4x100m at the 2004 Olympics, left long-time coach Steve Platt to join Eton-based Tony Lester last August.
"I'm fighting fit and it's like I've been given a second chance," the 23-year-old told BBC Five Live.
"The training I'm doing now isn't easy but has excited me and made me realise what I was missing out on."
Lewis-Francis, who trains with fellow sprinter Marlon Devonish and 400m runner Tim Benjamin, said he has benefited from working in a group environment.
"Some of the sessions aren't easy (but) Marlon and Tim are there for moral support and a chit-chat," said Lewis-Francis.
The Birmingham native won the world junior 100m crown in 2000 but is yet to win a major senior individual outdoor title.
Lewis-Francis will have two chances to put that right this year as the Commonwealth Games are in Melbourne in March, and the European Championships take place in Gothenburg in August.