Sandbag
training would be new to me, but I would call it a work detail
(picture below is from November 1990 making sand bags in Bahrain before the kickoff)
On the subject of new, I see at the gym (Civilian Health club) so many "new" methods that it makes me laugh...people are paying trainers to tell them how to do Iron Mike's, 8 count body builders..etc..etc...
Most of the things out there are considered new ideas but have been around for years they just call it something else... I think I am in the wrong line of work...I could ,make so much money it seems on "smoking" people in the civilian world...