The Mounted Archery Camp is a location in The Legend of Zelda: Breath of the Wild. It is located in the Faron Grasslands region of Hyrule. Jini runs a mounted archery course where Link can compete and hone his horseback archery skills.
Horseback Archery Drill
Jini runs the horseback archery drill though requires Link to have at least one Bow and a Horse to participate. Jini however will sell Link Arrows before he starts, thus the camp also functions as an Arrow Shop. The drill costs 20 Rupees. During the drill, Link is tasked with popping 20 Balloon Targets while shooting from horseback in under a minute. If Link manages to hit all 20 balloons, he will be rewarded with the Knight's Bridle and Knight's Saddle for his horses. Link should make sure to bring a good sturdy bow and a fully bonded Horse as to ensure it will follow the path and not disobey Link. Additionally a long range bow such as the Falcon Bow or Great Eagle Bow with a Quick Shot bonus can help with hitting targets easier.
In addition to Jini and his mounted archery drill, Link can also find Straia who is doing a survey of the region and asks Link if he could tame the Giant Horse living in Taobab Grassland. Link must be careful as two Lynels appear on the path leading to the grasslands. Defeating the Lynels can make the side quest easier, though Link can simply tame the Giant Horse and race past them (this is made slightly difficult as the Giant Horse has 0 Stamina and thus no Spurs). Once Link has the horse and returns to the Mounted Archery Camp he only has to show the Giant Horse to Straia to complete the quest, though Link can ride it to the Highland Stable and register it before or after talking to Straia, allowing him to keep the Giant Horse.