Why do lizards do push-ups?

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Why: Saw a little guy by the pool today. Called him Artie after Slater's pal who died. He was doing push-ups like this:

Answer: Several reasons!

• To display how strong their teeny adorable muscles are
• To tell other lizards to GTFO
• To say, "Hey, human: I see you, and you better not try anything!"
  

One researcher said:

As in humans, if an anole can do many of these push-ups, it shows that he is in prime physical condition. These displays of strength help avert actual physical confrontations between male lizards, which can be very fierce and destructive.

Source: LiveScience

The More You Know: A lot of lizards do this at dawn and dusk to mark their territories. Many other animals - from birds to primates - put on territorial displays at these times, but theirs are all noisy. Lizards are the only ones who perform for the eyes.