The Scots-born star lives in London but has chosen to run north of the Border - even though sh e admits she will "probably fall over..."
Gail laughs: "Everything I do is slightly embarrassing, including running. You watch me on March 23. I run hen-toed, fall over - I end up smiling at people and looking at stuff and trying to do three things at once.
"It's the same with other sports. I once got an award for being the worst hockey player in Edinburgh because I kept hitting other girls' shins with the hockey stick.
And in martial arts, I was smiling at my brother in the middle of a tournament, thinking I was doing really well, when my opponent caught me off guard on the side of my temple and knocked me out! That was pretty embarrassing."
Gail is urging everyone to join her in Glasgow for the mile which is part of the Sainsbury's Sport Relief weekend.
"Sport Relief is a great charity and I love doing anything Scottish, so this combines two of my favourite things," she smiles.
"I'm actually from Edinburgh but I love Glasgow. I like the people, the humour and the weather - the fact that you have absolutely no idea what will happen in any one day."
She adds: "People in Scotland are always out to help each other and when you go to Glasgow, or Edinburgh, people will talk to you about anything."
Gail still has friends and family, including her best friend from childhood, her dad and brother, in Scotland although she admits she does not get as much time up here as she would like.
"I don't get to go to my home town very often so maybe after doing the Glasgow Mile I will just keep going and run to Edinburgh..."
Despite being a busy mum with a hectic work schedule, Gail manages to train most days.
"I run most days anyway, usually for about 45 minutes to one hour. I enjoy it," she says.
"Because I am freelance, my work schedule is not set in stone so I am quite lucky I can move things around, whether it's to pick up my daughter Honey at the weekends or from school."
She adds: "If you are thinking about doing the Mile, make the commitment.
"Life is too short, and it's great to be doing something positive to help other people. You can do a mile, which is not too far, and you can jog it or walk it if you feel you cannot run it. Just take part - that's the main thing!"
You can get involved in the Sainsbury's Sport Relief Games in Glasgow, which take place over the weekend of March 21 to 23.
You can run, walk or jog the Glasgow Mile by signing up for a one-mile, three-mile or six-mile course in Tollcross Park or get on your bike for the Sport Relief Cycle, a 25 or 50-mile ride on open roads from the Sir Chris Hoy Velodrome to Tollcross Park, where there will also be a Family Cycle for those looking for a more leisurely ride.
If you'd prefer to swim, head for Tollcross International Swimming Centre. It is hosting the Glasgow Sport Relief Swimathon - all you have to do is choose your distance (1.5km, 2.5km or 5km), work out whether you're doing it on your own or as part of a team, and make a splash for charity.
There are also Sport Relief Mile events taking place in Strathaven Park, Hamilton, Kilmarnock, Kilwinning, Ayr, Largs and Milngavie, Swimathons in Blantyre, Cambuslang, Kirkintilloch and in various locations around Ayrshire. Visit www.sportrelief.com for details.
Sport Relief Community Cash
The Evening Times has teamed up with Sport Relief to offer community groups a share of £50,000.
With the help of Foundation Scotland, we will make sure the money goes to those who need it most.
Find out how to apply for a Sport Relief Community Cash grant at www.foundationscotland.org.uk/srcommunitycash.
And don't forget to enter the Sainsbury's Sport Relief Games in Glasgow, which take place over the weekend of March 21 to 23.
The money you raise by running, swimming or cycling will be spent by Comic Relief to transform lives here in Glasgow, across the rest of the UK and in the world's poorest countries.