Spotted a lizard doing push ups? Here's why they do it and why they don't get tired of doing it.

Add Yahoo as a preferred source to see more of our stories on Google. Before the fence, there was the lizard. From tree stumps and rocks, the spiny reptiles basked and watched as wooden fences ...

Before the fence, there was the lizard. From tree stumps and rocks, the spiny reptiles basked and watched as wooden fences subdivided the landscape. At some point, one climbed a post and became known ...