Purpose of 'Conditioning' in training?

[Red_Might]

Can someone please enlighten me as to what this training category is actually for because I've always assumed it's for injured players, but to be honest I have no idea.

 

[Gwox]

I don't think that it's for injured players as they don't usually take part in full training. I think it is similar to the stamina category in that it makes players lose less conditioning when working hard and then regain it quicker afterwards, although I'm not entirely sure.