Is the exercise "The Fire Hydrant", for those who are familiar with the exercise, an unauthorized exercise during PRT?

To be more specific to my vote of "Heard yes, but no proof," is to say that there is a similar excercise in FM 7-22; the Quadraplex. Same basic concept as the fire hydrant, coupled with the forced balancing of the torso. Coupled with the bent leg raise, you achieve the same effect.

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If this exercise is the one I think it is, I am pretty sure it is not addressed in FM 7-22. That doesn't necessarily mean that it is unauthorized. I would say that if you are just doing exercises in FM 7-22 you are not doing good PT. I understand that PRT is doctrine but doctrine is just a guideline for leaders to follow. You should be doing much more in order to be physically fit. I think the fire hydrant use to be called the "red dick dog" back in my day, I could be wrong though.