A movement can look graceful while requiring the person inside it to work hard.

Ease on the outside is often produced by considerable effort on the inside, and the effort is hidden deliberately, because showing it would spoil the effect. What you are watching is not an absence of strain but the successful concealment of it. The same holds well beyond performance: a calm colleague, a friend who makes the visit look simple, a person moving through a hard day without appearing to.

Before assuming something is easy for someone, consider that looking easy may have been the work. Asking what it actually took usually produces a longer answer than the surface suggested.