Ease I Relaxed Feel Comfort Feeling Make Change

If you are at ease, you are feeling confident and relaxed and can talk to people without feeling nervous or anxious. If you put someone at ease, you make them feel at ease.

I also know that after I run, I will have even more energy for the 

rest of the day. I'll feel more relaxed and at ease.

I did my best to make him feel at ease.

They no longer felt at ease [=comfortable] with each other.

Her relaxed manner at the meeting put/set everyone at (their) ease.

The comfort zone is a psychological state in which one feels familiar, safe, at ease, and secure. You never change your life until you step out of your comfort zone; change begins at the end of your comfort zone.