Rugby Players Bulge

[vernonk]

Watching the 6 Nations, I notice that the players have a smartphone shaped bulge in their shirts midway between their shoulder blades. What is causing that bulge?

[dannyk13]

Probably radio-microphones.

[wolf63]

http://www.skysports.com/rugby-league/news/12532/8792494/phil-clarke-says-statistics-have-become-crucial-in-rugby-league

[dannyk13]

https://www.reddit.com/r/rugbyunion/comments/3phu0x/what_is_the_lump_on_the_back_of_players_shirts/

[Flonska]

It's a small device, like a mobile phone, which records how far, how fast and how frequently a player runs. It also records the forces involved in the collisions when he's tackled/tackling.

The information is transmitted via a satellite back down to a receiver at the sidelines,