When it comes to endurance races, marathons are the most famous and popular. However, there are a myriad of synonyms for this 26.2-mile race. Ultramarathons, also known as ultra distance running, include races of varying distances, including 50 kilometers, 50 miles, and even 100 miles. Trail running races are becoming increasingly popular, taking place on challenging terrains such as mountains and forests. Triathlons involve a consecutive swim, bike, and run, with distances ranging from sprint to Ironman. Another synonym is the Spartan race, an obstacle course race that tests the physical and mental strength of its participants. No matter the synonym, each race requires dedication, determination, and a strong will to succeed.