1. Obtain Iguana.
2. Name Iguana “Skippy.”
3. Go to your psychiatrist and receive a “prescription” for your newfound pet iguana, classifying him as a “service iguana.”
4. Have the prescription read “To whom it may concern, I am the treating psychiatrist of Mr. Cosmie Silfa. I have been treating Mr. Silfa for depression. His pet iguana, Skippy, helps him to maintain a stable mood as she provides companionship and motivation for him to stay well. She is an essential component of our treatment plan, and I recommend she continue to be able to live with Mr. Silfa in his apartment.”
5. Buy a bike helmet.
6. Go ride.

Simple!

[Pic by Burrito Justice]