In a Venn diagram, a square represents Chefs, a circle represents Cyclists and a triangle represents Musicians. If the intersection region of all three shapes contains the number $5$, how many individuals belong to all three groups - Musicians, Cyclists and Chefs?

To find the number of individuals who belong to all three groups simultaneously (Musicians, Cyclists, and Chefs), we need to look at the region common to all three geometric shapes: the square, the circle, and the triangle.
As specified, the intersection region of all three shapes contains the value $5$. Therefore, there are $5$ individuals who belong to all three groups.