Bag Sensors vs Athlete Sensors: How to Choose Boxing Tracking for Your Gym
If you're putting tracking into your classes, you'll quickly find there are two ways to do it - and they're more different than the marketing suggests.
You can put sensors on the bags, or you can put sensors on the people.
Everything else follows from that one decision: what you can measure, what your coaches can do with it, what it costs to run, and what happens the day someone wants to train on the pads instead.
We’ve built and tested both of these systems over the past 11 years and chosen our path. What follows is our honest read of both models, including the things bag-mounted systems do better than we do. If you only want the short version: bag sensors can be simpler to operate, wrist-worn sensors measure more. Which one is right depends on how your gym actually runs.
The two models
Bag-mounted systems - such as Impact Wrap - fix a sensor to each heavy bag. The sensor measures the impact the bag receives. A server in the gym collects the data and pushes scores to a screen on the wall.
Athlete-mounted systems - such as the Corner Gym System - put a small tracker on each member's wrists, worn under or inside their wraps. The tracker measures what the boxer's hands are doing, and streams to the same kind of leaderboard screen.
Same output on the wall. Very different data underneath.
Where bag sensors genuinely win
We'd rather you heard this from us than found it out after signing with us.
There's no hardware to hand out. This is the big one, and it's not a small advantage. With bag sensors, a member walks in, hits a bag, and appears on the leaderboard. Nobody at the front desk is distributing trackers, nobody is collecting them at the end, nothing goes home in a gym bag by accident, and nothing needs charging overnight. For a busy studio running back-to-back classes, that operational simplicity is worth real money.
Nothing to sanitise. Shared wearables need wiping between classes. Bags need wiping anyway.
Kicks count. This is a genuine physics advantage and we won't pretend otherwise. A wrist sensor sees hands. If you run kickboxing, Muay Thai or MMA classes and you want kicks, knees and elbows on the leaderboard, a bag sensor registers them and a wrist tracker doesn't. That's not a software gap we can close - it's where the sensor is.
One-off cost per bag, not per member. Your hardware cost scales with your bag wall, which is fixed. It doesn't grow as you add members.
If those four things describe your priorities, a bag-mounted system is a reasonable choice, and you should look seriously at one.
Where wrist-worn sensors win
The score belongs to the person, not the equipment.
This is the difference that matters most, and it's worth being precise about what it means.
A bag sensor measures force delivered to a bag. But the reading depends on the bag - its weight, how it's filled, how it's hung, and where on the bag the sensor sits. Impact Wrap say so themselves: their own documentation notes that scores vary by bag weight and sensor position, and describes the system's accuracy as roughly ±10–15% - "FitBit accurate," in their words.¹
That's fine for a bit of competitive noise in a class. It's a problem the moment two members compare scores and one of them was on the lighter bag.
An athlete-mounted tracker moves that problem. The sensor is on the person, so the reading follows them from bag to bag, and the comparison between two members is a comparison between two members.
It works when there's no bag. Pads. Sparring. Shadow boxing. Ring work. Roughly half of what happens in a serious boxing gym doesn't involve a heavy bag at all, and a bag sensor is blind to all of it. The Corner Gym System tracks shadow, bag, pad and ring work - because the sensor is on the hands doing the work.
This is also what lets you run tracking in a class that isn't bag-based, which matters if your timetable includes technical sessions, partner work, or one-to-one coaching.
You know who did what, without a check-in step. A bag knows a bag got hit. It needs a separate step to know who hit it. A tracker assigned to a member already knows.
Members can own their own. This one has no equivalent on the bag side. A member can buy their own Corner Performance Trackers and they pair automatically with the gym's Group system. They train at your gym on the leaderboard, then keep training at home or at open gym with the same tracker and the same profile. Their data is continuous, and their relationship with your gym extends past the class hour. A sensor bolted to your bag cannot leave the building.
Richer metrics. Because we're reading hand movement rather than bag impact, the system reports punch count, speed, power and calories, and rolls them into a single K.O. Points score for the session - one number a member can chase week to week.
What each one actually costs
Cost is where these two models diverge most sharply, and not in the way you'd expect.
| Corner Gym System | Impact Wrap | |
|---|---|---|
| Hardware to start | $495 Group Starter Pack: 2 Gym Tracker Pairs, 2 wristbands, 2 dual chargers, 1 month subscription included | Trackers priced separately (not published) |
| Setup fee | None | $399 one-time server fee2 |
| Subscription | From $49/month, the micro tier the Starter Pack rolls onto, scaling with tracker count and sessions run | $149/month promotional, $199 regular2 |
| Minimum commitment | None, 30-day money-back guarantee | 12 months, with a 60-day money-back guarantee2 |
| Infrastructure required | A screen | 1 server per 8 bags, hardwired ethernet (their documentation specifies no WiFi), gym-supplied TVs |
Be careful with the monthly figures - including ours. Our subscription scales with how many trackers you run and how many sessions you put through the system. A small studio will pay less than a large multi-class gym. We are not universally cheaper, and if you run a high volume of classes across a lot of trackers, you may well land above a flat monthly fee. Ask us for a real number for your gym rather than working from the starting price.
The difference that holds regardless of your size is what you have to put in before the first class runs. To be fair to Impact Wrap on this: they advertise a 60-day money-back guarantee, which is a longer window than our 30. The distinction isn't the refund period.
It's the install. Starting with Corner means a screen and a box of trackers, and backing out means posting the box back. A bag-mounted system asks for a server per eight bags, hardwired ethernet run through your bag wall, a $399 setup fee and a twelve-month term. Their guarantee can return the money; it can't un-run the cabling or give you back the day the electrician was in.
That's not a small distinction when you're adding an unproven line item to a gym's monthly costs.
The question that actually decides it
Not "which is better" - "what happens in your gym?"
Choose a bag-mounted system if:
Your classes are almost entirely heavy-bag circuits
You run kicks and want them scored
Front-desk simplicity outranks data depth
You have a fixed bag wall and a stable class format
You're comfortable with a twelve-month commitment and a cabled install
Choose an athlete-mounted system if:
Your timetable includes pads, sparring, shadow or technical work
You want scores that are comparable between members
You want per-member data your coaches can act on
You want members to be able to buy in personally and keep training between classes
You'd rather trial something for a month than commit for a year
Plenty of gyms sit in the middle. If you're one of them, the trial matters more than the spec sheet.
One thing we can offer that a vendor can't
We run a boxing gym.
Corner HQ in Manchester is a real, functioning gym with real members and a real timetable - and it's where the Corner Gym System gets tested before it reaches you. When something doesn't work in a live class, we find out the same way you would: in the room, mid-round, with twelve people waiting.
That's not a marketing line. It's the reason the system is designed the way it is - wrap and go, no setup ritual, nothing that needs a staff member babysitting it. Those decisions came from running classes, not from a spec document.
We're not aware of another tracking company that operates its own gym. Most sell into gyms they've never worked a shift in.
You don't have to take our word for how it lands with members:
"Corner has become a core part of what we do. Since bringing it in, retention is up 35%, members are pushing harder in class, and they're seeing results faster. It's a win-win."
Jab Boxing
"We've been using the Corner Group system for over 5 years."
Punch Hub, UK - who have since opened a second studio featuring it
Over 100 gyms have run the system worldwide, from independent clubs to Virgin Active.
Try it before you commit
The Group Starter Pack is $495 - two Corner Gym Tracker Pairs, two wristbands, two dual chargers, and a month of subscription included. Enough to run it in a PT session or a small group class and see what your members do when the scores go up on the wall.
Thirty days money back if it isn't for you.
¹ Accuracy characterisation and the note that scores vary with bag weight and sensor placement are Impact Wrap's own, from their published gym documentation, captured 2026-07-22. ² Pricing, commitment term and guarantee from impactwrap.com/summer-special/ and impactwrap.com, re-checked 2026-07-29. Promotional pricing changes - check their current terms before making a decision.
Corner pricing correct at time of writing. Subscription scales with tracker count and session volume; contact us for a quote for your gym.
