Nothing except tell time - it is just cheap watch mechanism moulded into a latex rubber band.
If you are a truly convinced that they do something positive you yourself will emulate the expected effects, by the means of a so called Placebo effect.
The Rumba originated from Cuba.
The Rumba originated in Cuba.
Rumba Yes She wants to dance Rumba Yes She wants to dance (Rumba a type of latin dance)
Rumba originated in Cuba.
Alberts Rumba died in 1962.
Alberts Rumba was born in 1892.
Rumba Mamá was created in 1977.
Rumba Rapids was created in 1987.
Last Rumba in Havana was created in 2001.
Samba is from Brazil. Rumba is from Cuba.
The duration of Rumba Rapids is 240.0 seconds.
Rumba is also sometimes spelled "Rhumba".