Reese Witherspoon gives glimpse of how she stays so fit as she goes for a run ...

She is an ageless who somehow manages to look effortlessly beautiful in every setting.

And Reese Witherspoon gave a glimpse into how she keeps her perfect figure on  Saturday, when she was spotted going for a run in Los Angeles.

The 42-year-old actress looked fit while out on the jog as she kept up an impressive pace along the dirt path.

Strong: Reese Witherspoon gave a glimpse into how she keeps her perfect figure on Saturday, when she was spotted going for a run in Los Angeles

Strong: Reese Witherspoon gave a glimpse into how she keeps her perfect figure on Saturday, when she was spotted going for a run in Los Angeles

Reese donned full workout regalia matching black leggings that showed of her strong, yet slender stems with a black tank top.

The all-black ensemble also featured tennis shoes and a hat, which she pulled down low over her forehead.

Her long blonde tresses were pulled into a simple ponytail and they blew back  behind her head.

She shaded her eyes with dark sunglasses and her arms looked toned. 

Despite it looking like a challenging workout, the This Means War star was all smile as she trotted

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