This video is currently the best "spectator" experience of the essence and beauty of freediving. Having the discipline to maintain mental and physiological peace while being physically active in a normally-inhospitable environment allows you to be there fully and enjoy it. For me, that’s one of the primary attractions of freediving. It’s very humbling and spiritual.
The simplicity of gear is a big plus, too. (Though the really simple and refined gear can get quite pricey.)