Some are regular feeders (no ice pack); to keep it cold, you can freeze the cat food in individual portions; and put them frozen in compartments!
Others are refrigerated, they come with ice packs; put food in compartments; set up feeding time and ice pack will keep it cold!
You can also have some with microchips (useful if many cats with special diets); each cat has its own microchip which communicates with its own feeder!
Have a good afternoon at your health club ! Always nice to take time for ourselves!