Statistically speaking, free throws made under handed are more likely to score. Many NBA players have switched from overhand to underhand to improve their stats. It's a fact that underhand free throws are more likely to make it. However, some of the worst free throwers in history refused to switch. Shaq. Wilt Chamberlain. Wilt Chamberlain did switch and did improve his stats for one season, but switched back. This is a great issue to be aware of because when the cold hard math, science and repeated results keep showing us it is a fact that NBA players should be throwing underhand, they won't. Sometimes, people find it impossible to make the smart, obvious choice. https://detroitjockcity.com/2017/05/31/underhanded-free-throws-work-dont-players-shoot/