Tested and Proven: NEW Rucker 4.0 20L Rucker 4.0 was purpose built for rucking and rucksack training. If you train hard on dirt, grass, and concrete, Rucker 4.0 is the tool for you to get stronger one rep and one mile at a time. The RuckerĀ® 4.0 is now upgraded to make it even easier …
