Simple rigging is very fast and easy to do. It is built as follows:
- All the body parts are independent
- All the timeline layers are attached to a master peg layer (trajectory layer)
The advantage of using this technique is that you are free to move any part around without being influenced by a parent layer.
However, since the parts are not parented to each other, the parts will move from point A to point B along a straight trajectory. The hand will not follow the arm's rotation. You will have to set more keyframes for the hand to move along a curved path.