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The hamstrings group is made up of three specific muscles: the Biceps Femoris, Semitendinosus, and Semimembranosus. These muscles are located at the back of the thigh and play a crucial role in knee flexion and hip extension. The Biceps Femoris has two heads (long and short) and contributes to the movement at both the hip and knee joints. The Semitendinosus and Semimembranosus are responsible for similar functions, assisting in flexing the knee and extending the hip, which is vital for activities such as running, jumping, and other dynamic movements.

Understanding the hamstrings’ anatomy and function is important for personal trainers as it helps in designing appropriate exercise programs and ensuring proper technique to prevent injuries during workouts. The other groups mentioned pertain to different muscle families; for instance, the vastus muscles and rectus femoris are part of the quadriceps, which are responsible for knee extension, whereas the other options list muscles that do not belong to the hamstrings and serve different roles in lower body movement.