Q Dear Grit Doctor, tell me you are joking that you don’t have a box overflowing with biscuits, bars and crisps at home for the kids. Mine would go(...)

We’ve all consumed a bunch of extra calories over the holidays, which have to go somewhere. Photograph: Thinkstock Images

Q Grit Doctor, I have been reading your book and it is really encouraging. I have been walking at a fast pace for 45 minutes a day and riding the bike(...)

Ruth Field says walk, or make it your mission to find an alternative exercise that meets the minimum exercise requirements. And do it now. Photograph: Getty Images/iStockphoto

Q I’m turning 40 and feeling terrified about it. I can’t believe I’m so old. I look back on my life and feel as though I’ve got nothing to show for it(...)

Running mates: a time might come when your companion starts to slow you down - or simply annoy you. Photograph: Getty Images/Fuse

Q I have a serious running dilemma. I recently started running with another local mum on the school run. She was inspired by my dropping the kids off (...)

Q I always feel the same every Christmas: I make a huge effort to buy thoughtful gifts for all my family and no one ever does the same for me, and it (...)

The first rule of committed running is to run whatever the weather conditions. Photograph: Getty Images

Dear Grit Doctor, it’s raining pretty much all day every day, and I never seem to have an opportunity to run. The only time it’s not raining is when I(...)

Olfactory blues: what are you to do when something doesn’t smell right in your relationship? Photograph: Thinkstock

Q I love my partner dearly, but he is dirty – and not in a good way. He doesn’t wash or wear clean clothes. He wasn’t always like this, and he definit(...)

The grit doctor says: ‘Remind yourself through your gritted teeth that none of it is supposed to be easy.’ Photograph: Thinkstock

Q First four-mile (6.4k) run done in ages, I’m soo slow and shattered, u take the eye off the ball for one second and you’re screwed @gritdoctor help!(...)

Don’t restrict yourself to your Tinder app. Get online with other dating agencies. Photograph: Thinkstock

Q I have a moral dilemma. I recently broke off a five-year relationship and have been enjoying being single again. I met a younger guy and the chemist(...)

Being active is every bit as necessary to me for a great holiday as all the wine, cheese and merrymaking . . . and the long stretches of runnable sandy beach are drawing me in. Photograph: iStockphoto

Q So, Ruth, do you really run on your holidays or do you just say that to make us feel bad about ourselves? I don’t see how it is possible with three (...)