Physical endurance is differentiated from other forms of physical stress in that in endurance exercise fatigue of the muscles and cardiovascular system do not force the effort to end. The need for sleep, the buildup of non-recyclable waste chemicals, the depletion of convertible energy stores and other needed chemicals (e.g., water, sodium), physical injury, psychological failure, or attainment of the goal will bring the effort to an end
In equestrian sport, endurance riding refers to long distance races (often 100 miles) by one horse-rider pair. Endurance races were part of military history and also have a place in the history of the American West. The Tevis Cup is a famous race from the east to the west side of the Sierra Nevada. It is an international sport and is governed at the international level by the Federation Equestre Internationale (FEI).
The Shahzada is an Australian National Event With Riders Travelling from all over the Country to compete, it is a ride consisting of 160 km (or 100 miles) per day for 4 days
In the UK the official Endurance Group is called 'Sport Endurance'.