Psychological research suggests a simple brain hack for temporarily boosting creativity and all it requires is a rubber ball. The technique itself is extremely simple: all you have to do is squeeze a rubber ball with your left hand as hard as you can for about a minute.
An original study on this technique by four Israeli researchers (Goldstein et al., 2010) found that subjects who squeezed a rubber ball with their left hand solved noticeably more problems on a remote associates test, a standard test of convergent thinking. This form of creative thinking, usually contrasted with divergent thinking, is most useful for “connecting the dots:” combining existing information, comparing and juggling ideas, solving problems with some specified criteria, or extracting ideas from other information. A lot of real-world innovation or typical business problem-solving depends heavily on convergent thinking.
Read more at Psych Central.