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This has been an extraordinary test of what it means to stick it out, OHara tells SELF.

Image may contain Clothing Apparel Kelli O’Hara Human and Person

Courtesy of Kelli O’Hara & Greg Naughton / Amanda K. Bailey

There were days when I thought, Could I do this?

But for the most part, I thought, Nothis is what I want to do.

Though OHara has long considered herself a runner, this will be herfirst marathon.

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Running continued to be an outlet for OHara as her career in show business took off.

When I was in my 20s, I would run Central Park all the time, or Riverside Park.

That was always my form of exercise and relaxation.

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But it was more like six milesit was never 26.2.

Theres a nostalgic element to the marathon for OHara too.

This past year, however, the timing finally felt right.

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I really do feel good about it.

I know its going to be hard.

Below, OHara tells SELF about the running favorites shell be using on race day.

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I wear theRincon model.

Ive enjoyed them so much.

Ive been usingNeutrogena face sunscreen, 110 SPF, but I just use it everywhere.

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Im very fair, and when youre spending hours training under the sun, you really need it.

Goodr OGs Sunglasses

goodr OGs Sunglasses

REI

I always wear myGoodr sunglasseswhen Im exercising outside.

The shape is really streamlined, and it has a reflective stripe for when I run in the dark.

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