stamina:physical or mental strength that lets you continue doing something for a long time without getting tired;耐力;e.g.
1.You need stamina to be a long-distance runner.
2.Elaine has the stamina and the determination to succeed.
willpower:the ability to control your mind and body in order to achieve something that you
want to do;意志力;e.g.
1.It took all his willpower to remain calm.
2.His attempts to stop smoking by willpower alone failed.