Ruck [noun]: Short for rucksack, a ruck is a weighted backpack.
Rucking [verb]: Think extreme hiking/trekking. Rucking involves carrying heavy weight in a ruck and moving as quickly as possible, over long distances and varied terrain.
So why ruck?
It is a high-impact exercise, which requires strength as well as muscle endurance.
Basically, embrace the suck.
It’s good for you.