If you have basic license with 3D Analyst extension, standard or advanced licenses, you can use Add Z Information. The tool
Adds information about elevation properties of features in a Z-enabled
I do not have any of the above requirements to test that, but you can give it a try if you have the proper license.
If you don't have the 3D ...
Google earth is able to load lot of geographical data including GPX (and KMZ)
it's as simple as File>Open choose the GPX format and your GPX file
For more : https://support.google.com/earth/answer/148095?hl=en