Credits, Attribution, and Resources

A jogger in the woods

jogger-515665_640.jpg by Antranias, Creative Commons CC0 license (public domain), found on pixabay.com.

A senior citizen in the city

man-438079_640.jpg by jp26jp, Creative Commons CC0 license (public domain), found on pixabay.com.

The Golden Gate Bridge

golden-gate-bridge-1031321_1280.jpg by Unsplash, Creative Commons CC0 license (public domain), found on pixabay.com.

Barbed wire

barbed-wire-420503_640.jpg by cocoparisienne, Creative Commons CC0 license (public domain), found on pixabay.com.

A number of cyclists

cycle-869650_1280.jpg by cpjohnson, Creative Commons CC0 license (public domain), found on pixabay.com.

Triathlon swimmers

point-mugu-89821_1280.jpg by tpsdave, Creative Commons CC0 license (public domain), found on pixabay.com.