Two-faced and hypocritical are different qualities. What do you think about the two-faced hypocritical individuals?

We humans are very hypocrites rather than being true to what we preach. Why does OOTD talk about how to eat smart and exercise ideally and to what effect. Can anyone give me an example? I suppose a person could be hypocritical even if the one they preach to is themselves– I’ve certainly heard “hypocrite” thrown in the context of failed new year’s resolutions, but this might not strictly be a proper usage.

A two-faced person shows one face over others in order to gain approval, while hiding his/her secret side.

What is the person that you have seen described is two-handed, but not hypocritical?