A broad range of activities undertaken during time we are not working.
These activities are usually governed by rules that are frequently broken in frustration and anger ... as we relax.
Some people's work is sport meaning they do sport when at work, but when we see them doing their work ... we're watching sport.
Some sports are purely spectator sports ie American Football, Mixed Martial Arts, Formula 1 racing and no sane fucker should be attempting them. Others are not all played at the highest level so any fat slob can have a go ... Golf, Tennis, Premiership Soccer etc.