How do you strap an F1 driver in his seat? Watch this...

There was a time believe it or not when Formula 1 drivers raced without seatbelts.

Mandatory since 1972, today's seat belts comprise a six point harness, which van be released by the driver with a single hand movement.

But to strap a driver into position requires outside help and a forceful squeeze by the designated mechanic to ensure a snug and tight fit.

Force India's Harry Rush, who works with Esteban Ocon, explains how it's done.

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Phillip van Osten

Motor racing was a backdrop from the outset in Phillip van Osten's life. Born in Southern California, Phillip grew up with the sights and sounds of fast cars thanks to his father, Dick van Osten, an editor and writer for Auto Speed and Sport and Motor Trend. Phillip's passion for racing grew even more when his family moved to Europe and he became acquainted with the extraordinary world of Grand Prix racing. He was an early contributor to the monthly French F1i Magazine, often providing a historic or business perspective on Formula 1's affairs. In 2012, he co-authored along with fellow journalist Pierre Van Vliet the English-language adaptation of a limited edition book devoted to the great Belgian driver Jacky Ickx. He also authored "The American Legacy in Formula 1", a book which recounts the trials and tribulations of American drivers in Grand Prix racing. Phillip is also a commentator for Belgian broadcaster Be.TV for the US Indycar series.