Shoulder Boulder / Chest Fly Attachment

I have been using the Shoulder Boulder for a few weeks, and I am very pleased with it. For the price, it exceeds my expectations. It functions very well for a number of exercises. I’m able to do lateral raises, rear raises, front raises, flat chest flys and incline chest flys. I store it high and to the side on the rear upright of my Rogue rack where it takes up little room and doesn’t get in the way of other lifts. I bring it down to the front when I want to use it. Fit and finish is fine. The 360 degree arm adjustment makes it easy to dial in each lift. It was packaged very well, and it arrived in perfect condition. I use it frequently and highly recommend it.

I purchased this attachment because I want to incorporate fly movements into my workouts but have issues with dumbbell flys putting more strain on my shoulders than my chest and shoulders. This attachment provides the most resistance where it is needed, in the middle of the movement, and tapers off at the start of the movement when the shoulder is most unstable.

It works perfect with my wall mounted 3x3 rack, and I use it for flat and incline chest flys and shoulder lateral raises. I love the squeeze I can get at the top of the chest fly movement that dumbbells simply cannot provide.

If there is one area of improvement is the threading on the back knob was tilted off center, so when I tighten the knob only one edge of it pushes on the back of the rack. This quickly damaged the rubber washer on the knob. It's an odd size, M16x3.0 mm, so not easy to find a replacement.

I really love using the shoulder boulder to train my shoulder over dumbbells, it just feels better during and after. I’m glad I added this to my home gym.

This was easy to put together, easy to install, and man does it do a number on the shoulders! Solid piece of equipment, and it is extremely smooth to use. I haven't used it for chest flyes yet, but so far I really like it. Also, I'm pretty sure I can use my ankle strap to attach the cable to it instead of using plates only.

Its very high quality. I have a monster g12 from Force Usa, the original version. My machine has 2×2 " tubing, so im having extra shims 3d printed to take up the slack. I also added a sleeve adapter to take the 5/8'" stud up to a 1" to fit into my smith machine. So , there is a little more I need to put in to it to make a perfect fit for my machine, but in the end I already know it will be worth it. Its really an amazing compact device. Untill my 3d prints are done , I have it mounted on my attachment wall . Looks great with all my innovative gear. Perfect addition.

Just bought this and it’s great! Big time space saver since my gym is just a bedroom. It’s going to be a bit of a learning curve to figure out the setup for all of the different exercises but so far a 10/10.

Thanks for making it to fit the uprights on the All-In-One trainer. Keep it up with your future ideas!

I love the Shoulder Boulder Attachment more with my 2 Ancore Units. Its smooth and eliminates the dead weight zone when using the small change plates. I mount the Shoulder Boulder on my rack above the Seal Row Pad for Reverse Flys as I try to strengthen my "rehab-ing" shoulders. I attach the Ancores to the front leg and the lower crossmember using quick sliding rack adapters. Now I really need to find the room to mount a single post rack to permanently attach the shoulder boulder to so I can use this every day. Unfortunately, I have to remove this from my rack for daily lifting exercises.

The Bells of Steel chest and shoulder attachment is the best on the market! I love the easy to use and versatility it offers for any rack not just BoS. Add that extra ummpf to your workout without compromising space.

Takes a bit of work to get everything adjusted properly and setup. Not as nice as a stand alone piece, but does the job. I find the workout is better if you hook to cable machine instead of using free weights. Free weights don’t keep muscles under tension for full range in my opinion .

Have really enjoyed this attachment! It works well for lateral raises, single arm front raises, rear delt raises as well as pec flys! Great addition to my home gym.

Assembly was easy and it fits tight onto my Manticore rack with no wiggle. I got a nice shoulder shoulder pump. Definitely felt different then when i use dumbbells.

Awesome attatchment real isolates the body part you aim to target.

I’ve only had my Shoulder Boulder for a week at the time of this review, so I’m still dialing things in. As far as I know, this is the only unit in its class that can do a lying pec fly. The others I’ve seen only allow for standing pec flys, which don’t seem to offer the same stretch. I added roller pads to my Shoulder Boulder (see my video below), which allow more force to be generated in most movements. It’s not the same feel as lying pec fly or standing lateral raise machines, but for the money and footprint, it’s a value add for any home gym.

Works well overall, would be 5 star if the hand grips had some movement

Works fine. Quality is not the best and the knob was damaged. Will use for a bit then sell or trash.