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I exercise three times a week to keep fit.

I must keep fit

If you want to run a marathon, you need to keep fit.

I think that running around is the best way to keep fit

Running helps me to keep fit

She practises yoga to keep fit

I used to keep fit, when I was younger.

You need to go to the gym to keep fit.

How do you keep fit?

I eat lots of fruit and do plenty of exercise to keep fit.