That's correct 💯. My first memory of him was from the TV back in the day.' In the United Kingdom, Prowse was well known as the Green Cross Man, a superhero invented to promote a road safety campaign for children in 1975. As a result of his association with the campaign, which ran between 1971 and 1990, he received the MBE in 2000.'

Some more information here:

Prowse won the British heavyweight weightlifting championship in 1962 and the following two years. He represented England in the weightlifting event at the 1962 British Empire and Commonwealth Games in Perth, Western Australia. During his bodybuilding course, Prowse became friends with Arnold Schwarzenegger and Lou Ferrigno.

Prowse could deadlift as much as 784 lb (356 kg) and was notable for being the first person to lift the Dinnie Stones. During his prime, Prowse weighed around 282 pounds (128 kg).

During the 1970s, Prowse developed a minor interest with wrestling and trained many British wrestlers of the time.

Prowse helped to train Christopher Reeve for the lead role in Superman (1978) after lobbying for the part himself.

In a television interview, he related how his response to being told "we've found our Superman" was "Thank you very much." Only then was he told that Reeve had been chosen for the role and he was to only be a trainer. He trained Cary Elwes for his role as Westley in The Princess Bride (1987).

Prowse also became fitness consultant to Harrods, ripped up phone books under the stage name 'Jack the Ripper', and opened a series of gyms, including The Dave Prowse Fitness Centre in Southwark, London. Notably, Arnold Schwarzenegger sometimes trained at Prowse's gym and the British bodybuilder was also a judge at the last Mr. Universe contest Schwarzenegger won.

After making his last professional film appearance as Vader in 1983, he returned his major focus on weightlifting and continued to appear on some strength demonstrations in the United Kingdom until the late 1990s.