Movement: Stride forward and grasp the knee of your elevated leg with the arm on the same side. Keeping your back upright, pull the knee up to your chest while extending onto the toe and forefoot of the other leg. Lower and continue striding, switching legs each time.
Repetitions: When both legs have completed one full step, this counts as one repetition.
Instructions and effects for the Walking Pull Ups exercise 
Movement in Sagittal Plane