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GravityFit vs TRS Slider: I Tested Both, $90-$195
A GolfWRX thread with 50-plus comments asks the same question I get in my inbox: how does the TRS Slider compare to the GravityFit TPro? Nobody answers. Golf Digest mentions both in one paragraph of a roundup but does not compare them. The golf industry puts them in different categories. One is a “fitness system.” One is a “setup aid.” That is marketing. They both fix the same thing: your arms flying away from your body during the swing.
I tested both. The GravityFit TPro Super Kit costs $194.95 and uses resistance cords attached to a spinal alignment device to teach posture and core activation. The TRS Slider costs $89.99 and uses a harness on your trail arm to keep your elbow connected to your torso. One costs twice as much as the other. Whether that extra $105 is worth it depends entirely on what your swing is doing wrong.
The Contenders
- GravityFit TPro Super Kit ($194.95): BackBow spinal alignment device, three Theraband resistance cords (yellow light, green heavy, red medium), stacker blocks, carry case. No app, no subscription. Free YouTube training library.
- TRS Slider ($89.99): single arm band worn on the trail arm, available in two chest sizes (Small 30-36, Large 44-plus). Designed by Robert Rock, former European Tour pro. No app, no subscription.
What Each One Actually Does
GravityFit TPro is a posture and core activation system built on 30 years of research by Dr. Carolyn Richardson, a pioneer in core stability science. The BackBow is a plastic brace that sits between your shoulder blades and gives you immediate sensory feedback when your spine moves out of alignment. You clip a resistance band to the BackBow and perform swing movements, drills, or even putting strokes. The band provides proprioceptive feedback. If your posture collapses or your arms disconnect, the band tension changes and you feel it instantly.
The Super Kit includes three bands. The yellow band is light, for skill development. You wear it while hitting balls. The green band is heavy, for strength and stability work during slow pivot drills. The red band is medium, for rehab and light exercise. You can wear the green band while sitting at your desk for passive posture correction. Cam Smith, Tommy Fleetwood, Jonas Blixt, Eric Van Rooyen, and Harris English all use it. Golfer Geeks rated it 5.0 out of 5.0 and called it “the most effective golf training aid for teaching fundamentals of good golf posture and golf movement.” The full GravityFit TPro review covers the 30-day testing process in detail.
TRS Slider solves one specific problem. Your trail arm disconnects from your body during the downswing, creating a chicken wing through impact. The Slider is a band that slides along your torso instead of locking in place. You get feedback without restriction. Robert Rock, a former European Tour pro with one of the most recognizable swings in golf, designed it. The construction is simple: a strap, a slider, and an adjustable fit. No cords, no BackBow, no multiple bands.
Golf Monthly reviewed it and called it “a genuinely innovative and highly effective training aid” that “uniquely achieves its goal of controlling the right arm function.” The mechanism is different from GravityFit. GravityFit teaches your whole body to stay in posture through resistance feedback. TRS Slider physically keeps your trail arm connected to your torso through a sliding harness.
The Price Gap
At $89.99, the TRS Slider is less than half the price of the GravityFit TPro Super Kit at $194.95. You can also get the GravityFit Swing Kit 2.0 at $154.95 direct from gravityfit.com, which includes two bands instead of three. Even the cheaper kit costs $65 more than the TRS Slider.
The question is whether you need full-body posture training or a single-issue arm connection fix. If your problem is specifically a flying trail elbow and nothing else, the TRS Slider solves it for $90. If your posture collapses from the top of the swing, or your core does not stabilize through rotation, the TRS Slider cannot help. It does not address spinal alignment, core activation, or setup posture.
Who Should Buy GravityFit TPro
If you slouch at address, lose your spine angle during the swing, or feel like your upper body comes apart through impact, GravityFit is the right tool. The BackBow gives you feedback the instant your posture breaks down. You cannot fake it. The band tension tells you immediately.
It is also the pick if you sit at a desk all day. The green band worn during desk work provides passive posture correction. Multiple reviewers mention this as a benefit that extends beyond golf. The posture and balance trainers guide for seniors covers how posture training fits into a broader improvement plan.
The downside: the green band is hard to unclip from the BackBow. Multiple reviewers mention pinched fingers. The YouTube training videos are scattered with no structured progression from day 1 to day 30. GravityFit’s website warns of shipping delays on all products except the Super Kit as of July 2026. At $195, it is objectively expensive compared to $15 generic resistance bands. The BackBow is the differentiator that justifies the price.
Who Should Buy TRS Slider
If your trail arm flies away from your body on the downswing and you cannot figure out why your ball striking is inconsistent, the TRS Slider is the direct fix. It costs $90, takes 10 seconds to put on, and gives you immediate feedback. You will feel the difference in your first swing.
It is the right pick if you are not sure you will stick with posture training. Start cheap. If the TRS Slider fixes your arm connection and you want to go deeper on posture and core, upgrade to GravityFit later. If the TRS Slider solves your problem and you stop thinking about it, you saved $105.
The limitation is narrow. The TRS Slider does one thing. It does not fix your setup posture, your core stability, your hip rotation, or your weight shift. If your arm disconnection is a symptom of a deeper posture problem, the Slider masks the symptom without fixing the cause.
The Verdict
Buy GravityFit TPro if your posture is the root problem. The BackBow feedback is immediate and the system works for every part of your game, from putting to driver. At $195, it is an investment, but it addresses the foundation of every swing fault. Tour pros use it because posture is the thing that breaks down first under pressure.
Buy TRS Slider if your specific problem is trail arm disconnection and you know it. At $90, it is the cheaper, faster, more targeted fix. Robert Rock’s swing is proof that arm-body connection matters, and the Slider teaches it simply.
If I had to pick one for a golfer I did not know, I would ask: does your posture look the same at address and at the top of your backswing? If no, buy GravityFit. If your posture is fine but your trail elbow flies, buy the TRS Slider. The diagnostic question tells you which tool to buy. The price gap tells you to start with the cheaper one if you are unsure.
Where to Buy
- GravityFit TPro Super Kit $194.95 at Amazon
- TRS Slider $89.99 at Amazon
Prices verified July 2026. As an Amazon Associate we earn from qualifying purchases.