The gluteus maximus is stretched by flexing and horizontally adducting the thigh (across the body) at the hip joint.

The gluteus maximus is stretched by flexing and horizontally adducting the thigh (across the body) at the hip joint.
The gluteus maximus is stretched by flexing and horizontally adducting the thigh (across the body) at the hip joint.
The gluteus maximus is stretched by flexing and horizontally adducting the thigh (across the body) at the hip joint.