Symmetry represents the body is divided into left and right sides, and the similarity between the symmetrical joints is calculated. Near the maximum value, the less symmetry there is between the left and right sides of the body with moving only one side of arm or leg, and near the minimum value, the more symmetry there is between the left and right sides of the body. 

To find the local minima, we identify the ranges where the values reach a low point within the dataset. A local minimum is a point where the value is lower than its neighboring values. This indicates periods of less activity or reduced movement. The detection is based on a threshold percentage (e.g., 20% above the minimum value) to focus on the most significant dips. The output lists the frame ranges where these dips occur and their respective values.