When Madonna was a teenager, with the encouragement of her dance teacher, she broke through the shackles that bound her. However, before that, she had mastered the dance skills through years of hard practice. She shows her talent through her dancing style, and the discerning teacher will say the words that will last her life. Interacting with others is essential to building confidence, but at the same time, we must not forget the importance of our own abilities. The father of Serena Williams and Venus Williams turned the sisters into tennis legends. The way he fostered the williams sisters' self-confidence is particularly commendable. He always told his sisters over and over again that he had confidence in them, that they would get out of the limits of tennis, get out of the shadow of poverty, and become the best athletes in the world. But he wasn't content to cultivate the williams sisters' confidence either. Under the supervision of their father, the sisters began to train hard from the age when they could hold the tennis racket. Residents of the small town of Compton, California, still remember the Williams sisters training: They spent almost all of their time on the tennis court, accompanied only by their father and a basket of tennis. Even the rampant bandits in the Compton area gave up three points to the Williams sisters, and even acted as bodyguards to prevent others from interfering with their training. The Williams sisters inherited from their father a very aggressive style of play, with a strong serve, a strong bottom line catch, a preference for strong attack tactics, and sometimes within two or three goals to end the game. The women's tennis world has never seen such a player. Their father told them to repeat and practice over and over again, especially to practice servings, and Serena Williams later became the first female tennis player to serve more than 200 km/h. Living up to their father's expectations, they did become the world's top tennis players, reaching the top spot in the International Women's Professional Tennis Federation (WTA). Serena Williams won a total of thirty-nine Grand Slam titles, including twenty-three women's singles titles, which broke Stevie Graf's record and won twelve women's doubles titles with her sister, one of which was won when she was two months pregnant! With such a brilliant record, she is worthy of the accolade of "the greatest female tennis player of all time". Not only that, she is also the only female tennis player in the history of tennis to win a Grand Slam in the final break reversal, that is, to face an unfavorable situation in a world-class competition, save the final point three times in a row at the critical moment of winning or losing with one goal, and finally turn defeat into victory, which requires a lot of confidence! This confidence comes from ability, and ability itself comes from high-intensity training. But confidence doesn't just depend on ability. Years of repetitive training will form a second nature, and the ability training will be integrated with the spirit and character to the extreme. Serena Williams is a typical example, and she herself seems to have become the embodiment of self-confidence. But does hard training necessarily lead to self-confidence?