Motor skiing is just one of the forms of skijoring. Other forms are being towed behind a horse, dog, or snowmobile. Skijor raced are held in many countries that have snow during the winter. The longest skijor race is in Kalevala, Russia and is 270 miles long.
Nobody knows the country of origin for sure, but it is believed that the first races were held in Scandinavia. Bavaria, Germany, is another place where motor skiing is thought to have originated. Around 1955, a group of crazy Germans decided to hold races in which they towed themselves around at high speeds with Porsches, Volkswagens, and motorbikes. They navigated race courses at speeds up to 100 miles per hour.
See for yourself in the video below. Since all of the skiiers are upright at the end of the race, we can presume (or hope) that despite the lack of other safety precautions, at least the cars had studded snow tires!
Do you think this is still the "world's most dangerous sport"? A lot of things have changes in the past 57 years.