Most gyms feature nautilus machines which isolate muscles—quadriceps, hamstrings, biceps, triceps, etc. in an artificial way bearing little resemblance to real life movement.
Think about your daily life. How many times do you stand up and sit down. Challenge yourself to use squat mechanics for an entire day and post how many squats or partial squats you did. This creates muscle memory, burns extra calories, and protects your knees. What else do you do everyday that could be improved with core strength or proper lifting technique?