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Inside a Pose Asset you can specify if you want the animation to be Additive or non-additive in the form of Full Body.
Usually, for full body animation, you will want to leave this as non-additive. This creates 0 or 1 weight values (0.2 is the same as 1 for example). Setting to Additive and providing a value between 0 and 1 might cause your character to compact, expand or scale undesirably. However, for facial animation, enabling Additive will give you more precision between min/max influence of a given curve.
You can also specify the Base Pose to use when converting to Additive.