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A jogger who wrote an open letter to an "idiot" van driver who heckled her about her weight says the reaction to it online is "crazy".

Lindsey Swift's Facebook post told the driver to "try driving with your eyes closed" if he was offended by seeing her running.

It has been shared online more than 4,000 times.

"Because he drove past in a van and I didn't have a chance to respond to him or anything like that I thought I'd just have the chance to have my say," said Swift.

"I thought I'd put my feelings down into words and let everybody know I'm more than just my size. I think that's such a small part of my character and I just wanted to express that in words," she added.

This clip is originally from 5 live Drive on Wednesday August 12 2015.