The phrase "great stamina" means having a lot of energy and endurance to do tasks or activities for a long time without getting tired or giving up. Full definition
Today, this remains an extremely versatile, protective and powerful breed with great stamina, strength of body and character. (petwave.com)
Also, the players work very hard off the ball with pressing and overlapping being a constant feature and are required to possess great stamina and work rate. (thehardtackle.com)
They were bred to have great stamina so that they could hunt all day. (tristateweimrescue.com)