Potential energy represents the height level of the body's center of mass. Near the maximum value, it can be considered a jumping position, and near the minimum value, it can be considered a sitting position. Specifically, a value of 0.4 typically corresponds to the initial standing position. At a peak value of 1 corresponds to actions like significant jump, 0.7 to actions like small jump, 0 to actions like sitting. 

To calculate the frame length, count the total number of frames in the dataset. Each frame represents a data point collected over time. The total frame length gives the duration of the motion or activity being analyzed. In this dataset, the total frame length is determined by the number of entries in the data array.