High Intensity Interval Training, or HIIT training, primarily has been designed with the lower-body in mind.  Welcome Battle Ropes– HIIT training’s Beast of a tool that focused on upper body, which challenges the core and lower body at the same time.  Cross Fit and Strong Men have been using this tool for quite some time- You can too! Check out the ONNIT’s website for the best tools for HIIT Training.