The act of relaxing entails engaging in an enjoyable activity so as to become less tired or anxious.  Like a vacation.  Some equate inactivity with relaxation but personally I think it is more about the kind of activity.

Boredom can be stressful.  Being able to occupy yourself in a  satisfying way is associated with enjoyment.  Waiting, wondering and not being sure what the future will bring, can be uncomfortable.

Enjoyment

Taking pleasure in something, i.e, feeling good, enjoying, is a key part of relaxation.  In fact, writing a song for profit or a wrting book or just practicing your profession can be relaxing.  (That is any profession ranging from accountant to swim suite model to doctor and all stops in-between).

Focusing on things that relax you is pleasurable.  A personal goal of mine is to seek maximum pleasure (as long as I don’t impinge on the pleasure of others).  Therefore doing things that are relaxing is something I seek out.

Keep on Moving

Sometimes the challenge is not about avoidance ( i.e., finding ways to not do stressful things).  The greater difficulty can sometimes be finding things that are pleasurable to do.

These can range from playing a video game to planting a garden.  Debating a topic or investing in the stock market.  There are a million activities humans can engage in.

An activity that provides maximum pleasure for one person might be an anathema to another.   For each of us, knowing what relaxes you and seeking it out, is an important part of living your life to the fullest.