Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Program | Exercise | Week | Muscles Worked | Type | Ab Ripper X | Length | Equipment |
| --- | --- | --- | --- | --- | --- | --- | --- |
| P90X | Yoga X | 1-13 | Full Body | Cardio, Stretch | No | 92:24 | Mat, Yoga blocks, Water and towel |
| P90X | Kenpō X | 1-13 | Full Body | Cardio | No | 58:46 | Heart rate monitor, Water and towel |
| P90X | X Stretch | 1-13 | Full Body | Stretch | No | 57:32 | Mat, Yoga blocks, Water and towel |
| P90X | Ab Ripper X | weekly | Abdominals, Core | Strength Training | N/A | 16:07 | Mat, Water and towel |
| P90X+ | Interval X Plus | 1-3, 9, 11 | Full Body | Cardio Workout | No, Abs/Core Plus instead | 40 min | Heart rate monitor, water and towel |
Question:
What is the ab ripper x when exercise is x stretch?
Answer:
No