Observation: I used to be a good hockey player, I have not practiced for 7 years so now I am bad. I also used to be a mathematics student at a high research uni

Observation: I used to be a good hockey player, I have not practiced for 7 years so now I am bad. I also used to be a mathematics student at a high research university 18 years ago. Now I can no longer calculate (whole number) quartics in my head. I have also found that if I practice on IQ test related questions I achieve a higher IQ score in other IQ tests. Appreciate the article but would suggest "exercising" your intelligence can make you more intelligent in that field.