5 weeks
Fun4Fit Challenge
Three categories: kCal Burners, Green Zone Master and FIT Points Leader.
Every heartbeat. Every member.
On the screen.
Smart4Fit turns every workout into a measurable, competitive experience: live heart rate on the screens in your gym, a Digital Twin report for every member and AI analytics for trainers. One fixed monthly price for the whole club.
free trial
0
days
per month for the club
from €
0
fee per member
€
0
Fun4Fit · HIIT 18:00 · Room 1Live · 24:12
Marko J.
86%
Ana P.
91%
Stefan M.
74%
Jelena K.
82%
Nikola R.
57%
Milica T.
66%
Z1 50–60%
Z2 60–70%
Z3 70–80%
Z4 80–90%
Z5 90%+
clubs across the Balkans trust Smart4Fit
0
+
longer member retention Active Life training centre, Odžaci
+
0
%
fewer injuries in the 2025/26 season ŽKK Student and ŽRK Naisa, Niš
-
0
%
years of experience in health and fitness monitoring
0
+
How do we start working together?
Try it first. Pay later.
Three steps with no risk for the club: the system runs in your gym for a month, and you decide based on how your members respond.
STEP 1 · MONTH 1
Free trial month
€0
We install the equipment, train your coaches and switch on the full system. Your members train with the live screen from day one.
STEP 2 · AFTER 30 DAYS
Equipment purchase
By agreement
Sensors are €50 each for up to 20; larger quantities and other equipment are agreed on a call. The equipment becomes the club’s property.
STEP 3 · FROM MONTH 2
Monthly subscription
START
€89
PRO
€149
ELITE
€249
One fixed price for the whole club. Add-ons are available with every package and can be changed month to month.
Packages
One price for the whole club.
A monthly Digital Twin report for every member and ranking reports are included in every package. The more members you add, the lower the price per member: with Pro and 120 members it is €1.24 per member per month, less than the average price of a coffee.
Smart4Fit
Start
Personal trainers and small studios
€89/ month
up to 40 users
- Monthly Digital Twin report for every user
- Monthly group report and ranking
- Real-time heart rate monitoring
- Calorie calculation and stress monitoring
- Freestyle training plan
- Support 9:00–17:00, onboarding and free updates
+€49 AI Digital Twin
+€99 Digital Twin Assessment
+€99 Digital Twin Assessment
Most popular
Fun4Fit Pro
Fitness and sports clubs
€149/ month
up to 120 users
Everything in Start, plus:
- Community challenges with prizes
- Customisable training plans
- Individual reports and progress tracking
- Trainer feedback
- Workout intensity analysis
+€49 AI Digital Twin
+€99 Digital Twin Assessment
+€99 Digital Twin Assessment
Unlimited
Fun4Fit Elite
Large clubs, chains and academies
€249/ month
unlimited users
Everything in Pro, plus:
- Recovery analysis and advanced analytics
- Wellness reports and stress management
- Nutrition plans and exclusive workouts
- Biomechanics analysis and comparison reports
- Club logo on the live screen
- Priority support
+€49 AI Digital Twin
+€99 Digital Twin Assessment
+€99 Digital Twin Assessment
Prices are in euros, excluding VAT. The first month is free; the subscription starts after the equipment purchase, whose price is agreed on a call. Add-ons are available with every package.
Digital Twin
A digital profile of every member. AI that reads it for you.
Every workout builds a member’s Digital Twin: heart rate response, intensity, recovery, stress and progress over time. The trainer gets ready-made insight, with no spreadsheets or manual analysis. Add-ons are available with every package, including Start.
Digital Twin reports
Included
A monthly individual report for every user plus a group ranking. In all packages.
HR zones
Intensity
Calories
Stress
Progress
AI Digital Twin
+€49 / mo
Powered by FitBot: AI recommendations for load and recovery, progress trends, and questions about your clients in plain language.
AI recommendations
Progress trends
Questions about clients
Digital Twin Assessment
+€99 / mo
Everything in AI Digital Twin, with unlimited queries, an in-depth assessment of every user and premium technical support.
Unlimited queries
In-depth assessment
Premium support
FitBot · example conversation
Who in the 6 pm group is showing signs of fatigue this week?
Three members are training above their usual heart rate response for the same effort. Recommendation: lighter sessions in Z2–Z3 until Friday.
Ana P.+9%Marko J.+6%Jelena K.+4%
How has Stefan progressed since September?
Stefan now finishes the same interval workout with an average heart rate 11 beats lower and faster recovery between sets.
Illustrative example · names and values are made up
Smart4Fit · FitBot
Generative AI built around the trainer, the client and the data.
FitBot is an AI assistant for professional trainers. Unlike ChatGPT, it does not start from an empty conversation: it already knows your client’s data, your working rules and the Smart4Fit expert knowledge base.
of trainers use AI daily or several times a week
0
%
believe AI will increase the value of being a certified trainer over the next five years
0
%
uses: workout programming ideas, content and marketing, scheduling and organisation
Top
0
Source: ISSA, “The Human Advantage”, survey of 90 trainers, 2025 · Athletech News
TODAY
Trainer → ChatGPT
Trainer → General AI → Generic answer
- Doesn’t know your client’s history
- The trainer retypes the data into every conversation
- The answer isn’t checked against your working rules
- Knowledge comes from the chat, not from measured data
WITH FITBOT
Trainer → FitBot → data + expert rules + LLM
Client data + Trainer’s rules + Knowledge base → LLM→ A suggestion the trainer approves
FitBot automatically receives structured, already interpreted context:
30 days of HR data
resting HR
HRV and stress
sleep
training load
previous workouts
RPE
Fun4Fit sessions
Running Analyzer
ROM result
client goals
trainer's rules
Four levels of AI in a trainer's work
LEVEL 1
Assistant
Writes and explains.
“Create a workout.”
LEVEL 2
Copilot
Helps with a specific client.
“Adjust today’s workout.”
LEVEL 3
Data Interpreter
Interprets sensor and training data.
“Why is recovery poor?”
LEVEL 4
AI Coach Platform
Combines data, expert rules and LLM
“What should I do with John today, and why?”
Five minutes before the session
With ChatGPT, a trainer with 10–20 clients collects and retypes the data every time:
“John, 45. Last session: RPE 8, bench press 80 kg × 8, sleep 6 h, resting HR +7% versus baseline. What should I change today?”
FitBot already has this data, so the trainer just asks.
FitBot · before John's session
What should we do with John today?
His resting heart rate is 7% above his average, he slept 6 h, and he finished his last session at RPE 8. Your rule: when recovery is poor, no max-effort sets.
Suggestion: keep bench press at 80 kg, but do 3 × 6 instead of 4 × 8, and Z2 cardio instead of intervals.
Suggestion: keep bench press at 80 kg, but do 3 × 6 instead of 4 × 8, and Z2 cardio instead of intervals.
Illustrative example · the trainer approves or changes the suggestion
The LLM is not the authority. The trainer is.
FitBot is a communication and reasoning layer on top of reliable data and expert rules. Research is heading the same way: GPTCoach (Stanford, CHI 2025) combines an LLM with wearable data for personalised coaching. FitBot is available with every package through AI Digital Twin (+€49) and Digital Twin Assessment (+€99).
Side-by-side comparison
What you get in each package
| Feature | Start€89 | Pro€149 | Elite€249 |
|---|---|---|---|
| Core · all packages | |||
| Monthly individual Digital Twin report | |||
| Monthly group report and ranking | |||
| Live smart HR monitoring | |||
| Calorie burn calculation | |||
| Stress monitoring | |||
| Freestyle training plan | |||
| Technical support 9:00–17:00, user guide, updates | |||
| Engagement and training · Pro and Elite | |||
| Community challenges with prizes | — | ||
| Customisable training plans | — | ||
| Individual reports and progress tracking | — | ||
| Trainer feedback | — | ||
| Workout intensity analysis | — | ||
| Advanced analytics · Elite | |||
| Recovery analysis | — | — | |
| Personalised wellness reports | — | — | |
| Advanced analytics and stress management | — | — | |
| Customised nutrition plans | — | — | |
| Exclusive workouts | — | — | |
| In-depth biomechanics analysis | — | — | |
| Comparison reports | — | — | |
| Club logo on the live screen | — | — | |
| Priority customer support | — | — | |
| Users | |||
| Number of users | up to 40 | up to 120 | unlimited |
Benefits
More members who stay. Trainers who know instead of guessing.
For club owners
Longer member retention
Rankings, points and visible progress give members a reason to come back.
An edge over competitors
A live screen in the gym is a difference prospects see on their very first trial session.
A new premium service
Charge for smart group classes, challenges and individual reports.
Predictable cost
One fixed monthly price; new members don’t increase the bill.
Marketing done by members
Results and rankings get shared on social media and bring in new people.
For trainers
Precise load management
Every athlete’s heart rate response live: you know when to push and when to ease off.
Fewer injuries and less overtraining
Objective fatigue data before it becomes a problem.
The whole group on one screen
Up to 120 or unlimited users at the same time.
Reports with no manual work
Digital Twin reports are generated automatically, ready for a conversation with the member.
An AI assistant
Ask about your clients and get recommendations and trends (add-on).
Partner stories
Results from our clubs
We increased average member retention by about 40%, and in 2026 we had to move to a bigger space.
Gojko Škundrić
Owner and head coach, Active Life training centre, Odžaci
The number of injuries dropped by more than 65%, so we had continuity in our work for the whole season.
Vladimir Živković
Strength and conditioning coach, ŽKK Student and ŽRK Naisa, Niš
We can clearly see the state each client is in and dose the training load precisely.
Dario Višnjić
Owner and head coach, Virtus fitness studio, Gradiška
Fun4Fit community
100+ clubs across the Balkans. A community that keeps growing.
Fun4Fit Community Challenges connect clubs across the region in shared challenges with a single leaderboard. Every workout earns points, and members get a reason to come every day.
clubs across the Balkans trust Smart4Fit
0
+
people in a community focused on healthy living
~
0
countries: Serbia, Bosnia and Herzegovina, Montenegro
0
days of the 2026 Balkan Summer Challenge
0
5 weeks
Boxing Punch Challenge
A club-versus-club league: punch speed, power and technique, measured by sensors.
2026
Balkan Summer Challenge
Every club in the ecosystem, one regional leaderboard.
Points per minute
Zones are personal (% of max heart rate), so every age group competes fairly.
Z1 50–60%1
Z2 60–70%2
Z3 70–80%3
Z4 80–90%4
Z5 90%+2
Bonuses for regulars: weekly streak ×1.5, morning workout +10, Saturday workout +15, friend brought in +30.
Challenges are included in the Fun4Fit subscription. The Smart4Fit team runs scoring, the leaderboard, posts and prizes, with no extra cost and no new staff at the club.
Equipment and return on investment
Minimal equipment. Calculate your return.
Equipment
Purchased after the trial month; the final price is agreed on a call
| ProSense heart rate sensorup to 20 units; over 20 by agreement | €50 each |
| Trainer tablet (Lenovo Tab M9)runs the session through the app | by agreement |
| Ant+ antenna (HUB)only for indoor team sports, over 12 m from the device | by agreement |
Most clubs don't need an antennaSmart4Fit and Fun4Fit work via Bluetooth (BLE) scanning, straight to the tablet. An Ant+ antenna is only needed for indoor team sports, when athletes are more than 12 m from the device.
The display needs a smart TV or monitor and a stable internet connection.
ROI calculator
An example for your club; you can change the values
× €50 each · over 20 by agreement
€149per month for the club
€2.48per member per month≈ the average price of a coffee · 291 RSD
5retained members cover the subscription
€300sensors, one-off
€1,939first year (sensors + 11 months)
The tablet and antenna (if needed) are agreed on a call and are not included in these amounts.
Terms
Clear terms, no small print
Commercial
- 30-day trial from installation, at no cost
- Equipment purchase after the trial, price by agreement
- Monthly subscription paid in advance, from month 2
- Add-ons can be changed month to month
Technical requirements
- A stable internet connection in the gym
- A smart TV or monitor for the live display
- Ant+ antenna only for indoor team sports (over 12 m)
- Fun4Fit app and Fun4Fit Visual licences included in the package
Joint promotion
- 1 social media post per month
- 1 reel per month
- 1 story per week, tagging @smart4fit
Switch on the screen. The first month is on us.
Book an installation and see within 30 days how your members respond to training with live data. No cost until the end of the trial.