Anchor: Although the stress is on swimming and sailing, you may well prefer to do nothing more strenuous than lie in the sun and be a spectator.
Entailed: If you prefer lying in the sun as a spectator over swimming and sailing, you can do that.
Contradiction: Swimming is compulsory and no-one is allowed to spectate.
Contradiction: I don't have a preference for any makers.
Contradiction: I want to learn more about your life.
Contradiction: The wall is a solid color.
Contradiction: A place in the dark