FIITY 18 Pounds Resistance Adjustable Rotator Machine for Upper Body Strength Training, 360 Degree Rotating Grips, Multifunctional Spinning Burn Machine for Forearm Trainer, Boxing, Workouts (Black &

You will definitely feel the arm and shoulders burn ,when used in part of a boxers workout routine.👍🏽

If you're looking for cardio and to build your endurance keeping your hands up for LONG periods of time like for boxing, I suggest getting the lighter one.For me, the heavier one is for weight training and more for building your shoulders.This particular weight (18lbs) is pretty heavy once you lift it above your shoulders doing 40 reps. It's more for the intermediate to expert weight trainer.But honestly, if you're a boxer I suggest getting both. Use the lighter one for maximum endurance (10x40-50) and finish it off with a few reps (3x40) of the heavier one.It's really solid, feels like a professional gym equipment. Pair perfectly with my PowerBlock.Gives you every nice burn and pump.

Quick and intense feeling of working out. Great arm and shoulder workout with the sensation of core building and tightening.

Excellent product for cardio, and upper body.

I’m quite pleased with this device! It can be stored easily. It’s sturdy and heavy duty (not lightweight at all). I get a good workout in a matter of seconds! I feel it in my arms, abs, and back. Great for work-from-home. I highly recommend, if you enjoy fitness challenges and want to tone your upper body.