X topic is a hard one and I struggled to find something else to write so this one is going to be on the short side. X marks the spot is a reference to a treasure hunt and is a good way to exercise, because there is a way to go on adventures now and find that X. It's also known as geocaching.
What is it?
Geocaching is a real-world, outdoor treasure hunting game using
GPS-enabled devices. Participants navigate to a specific set of GPS
coordinates and then attempt to find the geocache (container) hidden at
Sites with more information:
Ever heard of geocaching?
Have you tried it yet?