Amazing and unconventional shoulder and full body exercise.
Three stages of variation.

What makes this exercise so great are the different levels of weight shift, gravity and force of the bar and using your full body to generate power when pushing and catching.

Form is very important for this exercise especially when using more weight and generating more force with more dynamic.

Variation 1:
Shoulder wide stand, knees slightly bent, back straight leaning a little forward. Starting position of pole is the highest point. This is where you have the most power to hold it.
Bring it down to one side, wrist straight, upper arms parallel to your body and then push it, let go, grab it with the other hand and slow it down. Repeat.

Variation 2:
Same as variation 1 only with a split stance.

Variation 3:
Same as 1 & 2 only that the body position is a lunge.
Since your body position is lower and the bar has a different angle and weight at its lowest point, make sure to adjust position so your wrist will be straight.
This also means the bar can be pushed even higher resulting in more explosiveness, acceleration and therefore more force and weight when catching and slowing down.
This also engages core and body stability a lot more.

*Barbell shown in the video has 20Kg