The Quahog Gym is where Phineas & Barnaby regularly workout.
In "He's Too Sexy for His Fat", Peter took Chris here during his exercise regimen when he thought was overweight.
Peter also took Joe here in "Ready, Willing, and Disabled" to prepare for the Special People's Games.
Peter decides to work out in "Bill and Peter's Bogus Journey" after having an encounter with an octopus.