Looking on the internet deeply has found these results:

I used to keep fit is the most popular phrase on the web.

I used to be keep fit 10 results on the web	I used to keep fit 1177 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
It doesn't look like this phrase is very popular! The search could not find any examples on the internet.	Before my children were born (Katelyn 9 and Mitch 4) I used to keep fit by road cycling in the hills and hiking the moors around Lancashire and Yorkshire before �... I used to keep fit, mainly by jogging and cycling, and occasionally I think about resuming these activities! Heather Turnbull, Citizen Advocacy Development�... I used to keep fit by biking to work, and it took a while to find a new routine that I liked as much as that. But like Meg, it keeps me sane and it's been worth making �... Aug 2, 2013 ... I used to keep: fit by running and going to loud step aerobics classes. Now I gain strength (mind and body) through yoga. I used to believe: that I�...

I used to be keep fit

10 results on the web

I used to keep fit

1177 results on the web

More popular!

It doesn't look like this phrase is very popular! The search could not find any examples on the internet.

Before my children were born (Katelyn 9 and Mitch 4) I used to keep fit by road cycling in the hills and hiking the moors around Lancashire and Yorkshire before �...
I used to keep fit, mainly by jogging and cycling, and occasionally I think about resuming these activities! Heather Turnbull, Citizen Advocacy Development�...
I used to keep fit by biking to work, and it took a while to find a new routine that I liked as much as that. But like Meg, it keeps me sane and it's been worth making �...
Aug 2, 2013 ... I used to keep: fit by running and going to loud step aerobics classes. Now I gain strength (mind and body) through yoga. I used to believe: that I�...