Question: what are all the major muscle groups?
Answer: Rhomboids. Rhomboids are small back muscles that run from your upper back to the base of your neck on each side of your spine. ... 
Trapezius Muscles. ... 
Pectoral Muscles. ... 
Latissimus Dorsi. ... 
Lower Back Muscles. ... 
Arm Muscles (Biceps and Triceps Muscles) ... 
Forearm Muscles. ... 
Hand and Finger Muscles.