Yogi: How can I practice watching cause and effect?

Sayadaw: Obviously, intention and action because when the intention arises, action follows.

For example, why do you move and why do you not move? Because of intention, action follows, and when there is intention not to move, the body does not move. This mental and physical process happens throughout the day.

When we see something, the mind follows. It is cause and effect. Then the mind (intention) becomes the cause and the body movement is the effect. This is a chain cause-and-effect process because the causes and effects are connected. 

If you watch the mind and the body together, then you can understand better the relationship between the mind and the body.