I can explain the main muscle groups that are trained in the gym:

Chest: The chest muscles, or pectoralis muscles, are responsible for movements such as pushing and are located in the front of the upper torso. The main muscle in this group is the pectoralis major.

Back: The back muscles, including the latissimus dorsi and the trapezius, are responsible for movements such as pulling and are located along the spine and shoulder blades.

Legs: The leg muscles, including the quadriceps, hamstrings, and calf muscles, are responsible for movements such as squatting, jumping, and running.

Shoulders: The shoulder muscles, including the deltoids and rotator cuff muscles, are responsible for movements such as overhead pressing and are located in the upper arms and across the shoulders.

Biceps and Triceps: The biceps and triceps are the primary muscles responsible for movements such as curling and pressing, and are located in the upper arm.

Abs and Core: The abs and core muscles, including the rectus abdominis and obliques, are responsible for stabilizing the torso and are located in the midsection of the body.

These muscle groups are often trained together in workout routines. For example, chest and triceps are often trained together, as well as back and biceps, and legs and abs. This allows for a more balanced workout and helps to target multiple muscle groups in a single session.
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