Exercise or Xanax?

What a wonderful world it would be if our medical system prescribed exercise instead of prescription drugs for anxiety. A recently published study showed regular exercise reduced anxiety symptoms by 20%.

Is this a big deal? Here come some stats from 2008 US sales data:

• $14.6 billion in anti psychotics
• $9.6 billion in antidepressants
• $4.8 billion in ADHD meds

Grand total: $29 billion.

The 2008 budget for US National Parks operations: $2 billion.

Does anyone else see something wrong with this? It borders on criminal.