Now accepting early athletes

TRAIN FROM
THE CORE

AI-powered training, nutrition, and recovery — personalized to your sport, your body, and your schedule. Built by athletes who got tired of guessing.

Free to join. First in line when we launch.

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147 athletes on the waitlist

Kärna
"The core. The nucleus. The innermost part."
Swedish  /  ˈɧæːɳa /
What's inside
Everything your coach can't give you
01

AI training plans

Tell it your sport, position, equipment, and schedule. Get a weekly plan built just for you — adjusted every week based on how you're performing.

02

Athlete nutrition

Meal ideas and macro targets designed for teen athletes, not bodybuilders. Game day fuel. Rest day fuel. Different days, different plans.

03

Recovery intelligence

Log sleep, soreness, and energy. KÄRNA learns your patterns and tells you when to push and when to back off — so you peak on game day.

04

Game day prep

Pre-game activation routines, warm-ups tailored to your sport, and mental readiness tools. Walk onto the field knowing you're the most prepared athlete out there.

05

Progress tracking

See your lifts, speed, and conditioning improve over weeks. Share your progress card with teammates. Real data, real results.

06

Team mode

Invite your whole team. See who's putting in work. Compete on leaderboards. Hold each other accountable. The team that trains together wins together.

3 minutes to your first AI workout
01

Tell us about you

Your sport, position, experience level, available equipment, and weekly schedule. Takes two minutes.

02

Get your plan

AI builds your personalized training week — strength, conditioning, mobility, and sport-specific work. No cookie-cutter programs.

03

Train and level up

Complete workouts, log results, and watch your plan evolve. The AI learns what works for your body and gets smarter every week.

Built by an athlete

"I built KÄRNA because I was tired of generic workout plans that didn't understand my sport, my schedule, or my body. I wanted an AI coach that actually gets it."

— Peter, Founder & Lacrosse Athlete

Don't miss it

The athletes who
sign up first,
train first.

Waitlist members get free Pro access at launch, priority features, and a direct line to the founder.

You're in. We'll be in touch.