The reformed hellraiser used to hate exercise but since quitting alcohol three years ago he now enjoys working out.
He said: "I actually like the gym. I find peace in it. Which is f***ing weird. I never thought that would be me. I see these quotes, `Working out for me is lifting a Carlsberg.` It was true at the time. Things have changed."
Colin, 35, has also revealed his two sons - seven-year-old James, who suffers from Angelman syndrome, a neuro-developmental disorder which means he cannot speak, and 22-month-old Henry - have given him a clearer focus in his life and made him find a better balance between his work and family.
In an interview with the USA Today newspaper, he said: "I`m pretty clear on why I go to work now. I understand and have a respect for being away that I didn`t have for the first five, six, seven years. With two boys as well, I have a respect for missing people that are in my life, a respect for being away from my kids.
"I went for seven years working back to back to back to back. That became my life. That`s not the way it is now. I have more balance in regards to choosing things."