Human: I want to learn what the main muscle groups are for training in the gym. Please also clarify any main muscle groups that are generally worked together.
Assistant: The main muscle groups for training in the gym are:

Chest: Pectoral muscles
Back: Latissimus dorsi, rhomboids, trapezius, and erector spinae muscles
Legs: Quadriceps, hamstrings, calf muscles
Arms: Biceps, triceps, forearms
Shoulders: Deltoids, rotator cuff
Abdominals: Rectus abdominis, obliques, transverse abdominis

Muscles that are commonly trained together:

Chest and triceps: Triceps are worked when doing chest presses.
Biceps and back: Biceps are worked when doing pull-ups and back exercises.
Legs and glutes: Glutes are worked when doing squats and deadlifts.
Shoulders and abs: Abs are worked when doing overhead presses.
