The Operating System for Hybrid Athletes.
Break the silos. Synchronize heavy barbell wave periodization, gymnastics bodyweight mastery, and aerobic capacity in one unified, adaptive training calendar.
Looking for instant calculations? Try free Russian Squat & 1RM calculators on calc.kairon.fit →
100% Free Forever Tier
No credit card required
Voice Rest Timers
Hands-free gym countdowns
100% Offline Logging
Works in basement gyms
Coach Multi-Roster
1-Tap phone dispatch
Squat 1RM Baseline
182.5 kg
+7.5kg this block
Session Volume
1,740 kg
6 sets x 2 reps @ 80%
Calisthenics Target
Straddle Planche
5 x 10s isometric
Day 1 • Completed
6x3 @ 145 kg
RPE 8.0
Day 2 • Active
6x2 @ 145 kg
Target RPE 7.5
Day 3 • Next
6x4 @ 145 kg
Volume Peak
Day 4 • Cardio
8 km Zone 2
Recovery Base
Rest Timer (Audio Enabled)
01:42
Voice countdown active • 15s cue next
The Three Modalities
Built for Athletes Who Refuse to Specialize.
Most training apps assume you are either powerlifting, practicing handstands, or training for a marathon. KAIRON is engineered from the ground up for all three simultaneously.
Barbell Strength & Wave Periodization
Autoregulated Linear & Undulating Cycles
Eliminate guesswork. Build maximal strength using scientifically proven protocols like the Russian Squat Routine, Smolov Jr., and Prilepin intensity zones with automatic plate loading math.
- Automated 6-Week Russian Squat & Smolov generation
- Real-time RPE & RIR fatigue autoregulation
- Plate math calculator for barbell & calibrated plates
- 1RM history & calculated fatigue threshold graphs
Gymnastic & Bodyweight Skill Mastery
Tuck, Straddle & Full Isometric Progressions
Train straight-arm lever strength and bodyweight power without clunky timers. Track isometric hold times and weighted pull-up/dip 1RM benchmarks with strict form standards.
- Planche, Front Lever, & Muscle-Up step progressions
- Built-in hold stopwatch with auto-recorded seconds
- Weighted bodyweight load + athlete mass calculations
- Straight-arm tendon conditioning protocol reminders
Aerobic Engine & Capacity
Zone 2 Base & High-Intensity Intervals
Build a massive aerobic base without sacrificing your squat PR. Program Zone 2 base runs, rowing intervals, and track sprints that respect your CNS recovery budget.
- Concurrent training interference mitigations
- Zone 2 endurance & VO2 max interval builder
- Pace, split, and distance telemetry logging
- Weekly CNS fatigue score across all modalities
Built for the Chalk Box & Track
The In-Gym Android Companion.
Engineered in Jetpack Compose for extreme speed and battery efficiency. Built to operate flawlessly even when buried underground with zero cell reception.
Voice-Guided Rest Timers
Keep your phone in your pocket
Audio cues call out "30 seconds left", "10 seconds", and "Next set: 140kg x 3 reps". You focus entirely on breathing and chalking up.
100% Offline Logging
Zero signal? Zero lost reps.
Lifting in an underground concrete bunker or a remote track? KAIRON logs locally and syncs automatically when Wi-Fi returns.
1-Tap Coach Workout Hero
No digging through menus
Open the app and today’s prescribed workout sits front-and-center. Tap "Start Session" to begin with pre-filled target weights.
Smart Barbell Plate Math
Never misload under fatigue
One tap calculates the exact plate breakdown for standard 20kg bars, women’s 15kg bars, or fractional 0.5kg micro-plates.
Web Calculator Deep Links
From calc.kairon.fit to barbell in 1 tap
Generate a Russian Squat cycle on your laptop or web browser. Scan the QR code or tap the link to load it directly onto your phone.
Biometric & Data Privacy
Your athletic records belong to you
Export all historical training data, 1RM logs, and volume tonnage to CSV, Notion, or Google Sheets anytime. No lock-in.
Free Web Hub
Test Drive Our Sports-Science Calculators.
No account required. Use our free web generators right now on calc.kairon.fit, then export your entire routine directly onto your phone with 1 click.
Russian Squat Routine (RSR)
Generates exact loads for 6x2 up to 6x6 peaking cycles with plate loading breakdown.
Smolov Junior Protocol
Calculate 4-day/week bench press and squat cycles with micro-load ramp formulas.
Multi-Formula 1RM Calculator
Cross-analyzes Brzycki, Epley, and Lombardi formulas for high-accuracy 1RM prediction.
Weighted Pull-Up & Dip 1RM
Accurately calculates total system load by factoring athlete body mass alongside belt weight.
Replace WhatsApp Spreadsheets with a Real Command Center.
Managing 20 athletes via PDF attachments and messy WhatsApp threads is exhausting. KAIRON gives you a single pane of glass to program wave periodization and dispatch it directly to your athletes’ phones in seconds.
Eliminate WhatsApp Message Chaos
No more scrolling through 30 chat threads looking for what an athlete squatted last Tuesday. Everything is indexed.
Prescribe Multi-Week Wave Blueprints in 60s
Create custom periodization templates with relative % loads and dispatch them to 1 athlete or an entire roster instantly.
Real-Time Compliance & Missed Workout Alerts
Spot when an athlete skips accessory work or falls behind schedule before they stagnate or get injured.
Organization Multi-Coach Roles
Invite assistant coaches, track seat utilization, and maintain custom exercise video libraries under your gym banner.
Apex Hybrid Performance Club
Coach Roster • 8 / 10 Active Seats
Marcus King
Assigned: Russian Squat W4D1
Sarah Lin
Assigned: Straddle Planche + 5k
David Ross
Assigned: Smolov Jr. Bench W2D4
Transparent Pricing
Invest in Your Performance.
Start with our 100% free athlete tier forever. Upgrade whenever you need automated wave cycles, voice rest timers, or multi-athlete roster management.
Free Athlete
Essential training logging for solo hybrid lifters.
No credit card required. Free forever.
Pro Athlete
For serious hybrid athletes demanding automated periodization.
Billed monthly or $79/year (save 34%). Cancel anytime.
Coach & Gym Roster
For personal trainers, strength coaches, and micro-gyms.
Add additional athletes for just $3/athlete/mo.
Answers & Clarity
Frequently Asked Questions.
Have questions about periodization, offline tracking, or coach capabilities? We have answers.
Stop Guessing Your Training Loads. Start Moving with Precision.
Create your free account in 30 seconds. No credit card required. Experience voice rest timers, wave periodization, and seamless offline tracking today.