Keep fit means to stay in good physical condition by moving and exercising regularly. Fit here means healthy and strong, not suitable. You can say the same with stay fit.
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keep fit (by + -ing); stay fit; get fit; a keep-fit class (UK)
- I keep fit by cycling to work instead of taking the bus.
- My mum goes to a keep-fit class at the local community centre.
- It's hard to keep fit when you sit at a desk all day.
What changed
First versionI go swimming twice a week to keep in form.
RevisionI go swimming twice a week to keep fit.
Keep in form may seem logical, but form more often means a document you fill in or the shape of an object, while physical condition is described with fit or in shape. So in form was replaced with fit.
Keep in shape means almost the same as keep fit, but it often suggests keeping a good figure: She does yoga to keep in shape. Get fit means to get into good shape, for example after a break: I need to get fit before the hiking trip.
Your turn
Now that he works from home, Dan ___ fit by running in the park every morning.
Show the answer
keeps — With fit in the sense of in good shape, the verbs are keep, stay and get, so keeps is correct. Holds fit is not a combination native speakers use.
Describe how you keep fit. Name an activity and how often you do it.
I keep fit by playing tennis with a friend every Saturday morning.
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