...are any of you able to tell me the purpose of these vest-like pieces of equipment, as seen in the photo below, that footballers are often seen wearing during training?

Attachment: Liverpool-Training-Session.jpg (263.60Kb)

I was wondering about that myself after viewing several Facebook/Periscope videos of Palace training today at Paul Brown Stadium. I thought they may be a way to identify either offensive or defensive players during intra-squad scrimmages, but the sensor explanation seems to make sense.

Edited by cincybarge (16 Jul 2016 8.34am)

I think they are just fancy heart rate monitors, designed not to fall off. And to keep man-boobs in place.

It's 106 miles to Chicago, we got a full tank of gas, half a pack of cigarettes, it's dark... and we're wearing sunglasses.

it's new from electronic arts. allows you to control your player during the game. with me at the controls, YB will actually score on his shots this year.

It's a posture aid. They also take elocution lessons and learn how to put a doily under a tray of cucumber sandwiches.

With the crusts cut off, of course.