Timeline and Physics

So i start to make some animation using Cinemachine and timeline. I make a rough terrain for my character to walk on, but my character seems to walk through the terrain i built. How can my character looks like he walk on the terrain rather than walk through it?

 

My question is like, i want the physics affected on it.

 

I do, but it's still won't make it

 

Sounds like you would be best served by learning the basics on how things work here: https://unity3d.com/learn

 

What kind of terrain is it? I had this problem once when I imported terrain created in Blender. In such a case, the terrain would require a mesh collider component added to it. Mesh collider is used for uneven irregular terrain. If the terrain is simply a plain, it can have a box collider sort.