All athletes in major professional American sports (football, Basketball, hockey, Baseball, NASCAR) are considered professionals (or, pros). Professionals who are in their first full year of competition are considered "rookies". Hence, you can't be a rookie without being a professional.
Racing.
Back when it was started only rich people owned fast horses. So technically only Kings could participate. Hence the Sport Of Kings was born.
I believe the only sports you can do that in is running (sprint racing) and horse racing
both
Drag Racing as well as some forms of drift.
I'm only guessing this one, but since marine propellers are known as screws, it's quite possible that boat racing may be the sport. This is only a guess.
The Egyptian national sport is Camel Racing, where you either ride a 1or2 hump camel the quickest for 3weeks. Only living of Nesquik.
The only Olympic sport that involves animals is horse racing. The sport was included in the games from 1900 until 1912.
Force India are the only ever Indian F1 manafacturer to compete in the sport.
If your talking about racing then one race a week for only a few months. Racing is a very strenous sport with a large possiblity of injury, especially to young horses.
It depends on the sport like baseball people say Jayson Hayward but buster posey did the best and won the rookie of the year and for other sports i wouldn't really know cause i only really care about baseball
Almost certainly as old as the domesticated history of the horse - believed to be about 6000 years.