A person is deemed not to be a worker within the meaning of this Act while he is, pursuant to a contract –

(a) participating as a contestant in any sporting or athletic activity;

(b) engaged in training or preparing himself with a view to his so participating; or

(c) travelling in connection with his so participating or being so engaged –

if, under that contract, he is not entitled to any remuneration other than remuneration for the doing of those things.