The System is any and all aspects that you are aware and unaware of, starting with the 7 main body systems.
• Muscular System
• Skeletal system
• Nervous System
• Digesetive System
• Respiratory system
• Excretory system
• Circulatory system
Next is mind. That, people can work on every day and every minute, noticing the changes happening all the time, as they begin to realize more and more how The System works.
You've got balance, control, stress, emotions, and wellness.