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The REP ISO Arms are an adjustable jammer arm squat rack attachment focused on high functionality at a lower price than competitors. After using them for the past four months, we feel they offer the best value for home gym owners with a power rack, which is the typical value proposition for REP Fitness. We do recommend them, but feel the adjustment feature could be improved.
Home gym owners are always looking for ways to save space in their gyms. The REP Iso Arms are a power rack attachment that isn’t the first of its kind, but is the most budget-friendly currently available. They, like all adjustable jammer arms offer a ton of versatility and saves precious home gym floor space. We've been fans of adjustable jammer arms since reviewing the Rogue LT-1 Trolley System and think the value proposition along with some of the unique features REP has created will cause them to be featured in gyms all over.
Essentially, they’re an ideal option for a home gym.
In testing the ISO Arms for our review, we performed many different exercises, including bench press (with a unique mod,) incline press, shoulder press, shrugs, car deadlift, snatches, and even hip thrusts.
In addition to the typical movements allowed by jammer arms that move up and down the upright, the REP ISO Arms allow for the arms to be locked to be used for isometric holds (which is why they chose the name ISO.) However, what I like more about the ability to lock the arms is that they can be stored out of the way and be used for pull-ups, dips, and if you attach bands to them, they can be used for band-assisted jumps ala Cal Dietz, Triphasic Training.
The ISO Arms are also incredibly affordable at $399 when compared to other adjustable lever arm systems we’ve reviewed like the Rogue LT-1 .50 Cal Trolley System and the Sorinex Adjustable Jammer Arms.
There are certainly many features to like about the REP ISO Arms, which we’ll discuss, but the value (price to features ratio) of the Arms is what we like the most.
We’ve tested and reviewed all of the most popular jammer arm attachments. This includes the Rogue LT-1 Trolley System, Sorinex Adjustable Jammer Arms, as well as cheaper options like the Titan Jammer Arms. Although each of these has different parts that are superior to the ISO Arms, REP has basically combined many of the best functions of these and stripped the extra pieces to reduce cost without sacrificing functionality.
The REP ISO Arms can do all of the movements that their competitors can do including the snatch, overhead press, bench press, rows, deadlifts, and others while adding more variety thanks to the ability to lock the arms. In addition, the ISO Arms can adjust up and down the squat rack uprights, albeit not as well as their competitors like the rollers and bearings on Rogue’s version, but it can still accomplish the basic function.
Hiding beneath the metal female section of the ISO Arms that wraps around the power rack uprights are pieces of UHMW plastic that is similar to what’s found on j-cups and prevents metal on metal contact. These pieces do end up leaving residue on colored racks like my white REP PR-5000 Rack, but it’s not difficult to remove it.
This functionality of sliding up and down the uprights is essential to getting the most out of the arms. However, another function is dialing in the tightness of the brackets on the uprights.
If there’s too much play between the ISO Arms bracket and the squat rack uprights, the trainee will feel disconnected from the movement. I will say that the ISO Arms from REP are certainly not the tightest against the uprights in comparison to their competition like the Sorinex Adjustable Jammer Arms that feature a clampdown system. However, thanks to the two side pins, there is much less play than I initially expected with the arms.
The removable handles feature the same powder coating as the arms and arm brackets as well as the familiar REP stainless steel badge that is superior to stickers in my opinion. The handles, much like the competition can be removed and placed on the power racks cross members and used for pull-ups in addition to what they’re used for on the arms.
The handle has a knurled section for grip that is a nice touch and something not offered standard by any other companies.
The weight plate sleeves on the handles are chrome plated and have a rubber stopper on the end which makes loading plates easier and the chrome should prevent corrosion better than chipped powder coat.
In addition to being used for movements that most jammer arms are used for, the ISO Arms can also be used for belt squats out of the box. REP probably noticed the number of people creating DIY Belt Squats and decided to add eye hooks to the end of the arms. You can then attach a belt with a carabiner and do weighted belt squats. This is a cool, simple solution that shows to me that REP is listening to customers.
Although not as nice to use for squatting as the Sorinex J*Squat that we’ve reviewed, it gets the job done without any extra cost.
The last feature of the ISO Arms that we’ve been big fans of since getting them four months ago is the ability to lock the arms out in a fixed position. We leave ours placed in the highest position so they’re always out of the way and can also be used for pull-ups or attaching gymnastics rings to for dips. This functionality can also be extended to be used for isometric exercises or dips. This was a really smart feature and something we expect others to copy.
As we’ve stated in our REP PR-5000 Power Rack Review, the quality of the attachments is not on the same level of the rack and the ISO Arms are a great example of this. It makes sense on one hand, because they’re designed to be a more budget-friendly jammer arm alternative to the made in the USA options currently dominating the garage gym space. However, sometimes I wonder if REP should have two different lines. One that screams high quality, and another that is for those that are more cash conscious.
The adjustment system on the rack is okay. It works as previously stated, but due to how heavy the arms and brackets are, the handle on the back helps, but it’s still difficult to move up and down the rack’s uprights.
Due to the difficulty in moving the arms up and down the rack, I could foresee people using them less because of the setup time required. This is why the LT-1 Trolley System from Rogue Fitness is so nice because it’s very quick and seamless to move up and down.
The stability of the arms is pretty good, especially for the price, but it’s not as secure and locked-in feeling like the options from Sorinex and Rogue.
It’s pretty obvious the market REP Fitness is catering to. Those that want a high level of functionality without the added expense of being made in the USA and a less form, but more function.
The REP ISO Arms are great for those that don’t want to pay $1000 or more for the Rogue or Sorinex Adjustable Jammer/Lever Arms, but want the functionality. They’re a tremendous value and although I prefer the feeling and details of the competition, REP once again wins out for the best value.
The REP ISO Arms aren’t the only rack attachment of this sort. There are many on the market at varying price points.
REP ISO Arms vs. Rogue LT-1 Trolley System
The Rogue LT-1 Trolley System is the best adjustable lever arm system on the market. However, it’s also one of the most expensive. Rogue has had plans to expand the Trolley System line, but I’m not sure if they’ll come out with some of the attachments anymore.
Regardless, the REP ISO Arms are a much better value than Rogue’s offering. Rogue is made in the USA, offers a tremendous warranty, and has all of the high-end features and attention to detail they’re known for. In addition, the movement up and down the rack’s uprights is vastly superior on Rogues’ side in comparison to REP.
But, they’re also more than double the price of REP for what is essentially the same use cases. The ISO Arms actually surpass some of the functionality of Rogue when you experience the ability to lock in the arms for storage out of the way.
REP ISO Arms vs. Sorinex Adjustable Jammer Arms
Sorinex was the first to come out with jammer arms that adjust. This was a fantastic idea whose impact can be seen by the number of companies that have copied the idea and the number of home gyms that now have the equipment in their gyms. With that said, similar to the comparison to the Rogue LT-1 .50 Cal Trolley System, the ISO Arms from REP are simply a much better value when compared to Sorinex.
Sorinex’s system has better quality, but the adjustment method for the upright bracket is clumsy and awkward to move and much of the wear parts are still powder coated, such as the handles.
For most, the ISO Arms are a better value. However, the Sorinex Adjustable Jammer Arms are very smooth moving when in use and are the original design with a higher-end fit and finish.
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