All of the appointments at my gym kept getting booked so I made a Python script to book it automatically at midnight.
This uses selenium and the Gecko driver for Mozilla Firefox. Setup a cron job to run this script on a Linux/Unix box with a GUI.
You have to add your keyfob, lastname, the member authentication page, your club page, and your desired time to the environment variables at the top of joiner.py. This script books 2 days in advance.
Run python joiner.py to use the script.
Enjoy!