The Secret Language of Tennis Champions (2013)

I have friends who are twins. They too are opposite handed. They say it has something to do with sharing the womb (arms touching / pushed together?).

I grew up playing soccer with two twins, Brennan and Evan, one was left footed and one was right footed. Consequently, they played left and right midfielders (they were also both tall and lanky, good distance runners). They were an incredible duo and easily switched the ball across the field to each other.

They continued playing soccer competitively and played on the best state club team. I ended up at the same Uni where they were roommates and majored in the same things, took the same classes, joined the same fraternity, etc.

Unfortunately I didn't know them well enough to know if they had any sort of twin language or anything, but I wouldn't be at all surprised. I rarely saw them apart.