The gym at Courtyard by Marriott Guadalajara Andares receives mixed feedback from guests. While some highlight the good quality gym equipment and find the gym facilities to be incredible and very helpful for their workouts, others point out that the gym is outdated and in need of improvements. Additionally, there are mentions of limited gym amenities and issues such as a non-functional running machine. Despite these drawbacks, the facility offers a useful space for maintaining fitness during a stay.