An AI coach for serious lifters

Stop guessing why your training isn’t working.

Kai is your AI coach, connected to your training data and holding you accountable to your goals.

→ Kai sees your last workout. ChatGPT doesn’t.

How it works

A coach that actually knows you.

Connect your training data once. From there, Kai works in the background, spotting patterns, answering questions in plain language, and checking in when life gets in the way.

Grounded in your training

Share your Hevy export once. Kai reads every set, every PR, every missed session, and remembers it. No re-explaining what you did last week.

Built around your goals

Tell Kai what you’re actually training for: bench 100kg by summer, sub-2-hour half marathon, post-injury return. Every reply is anchored to your specific goal.

Checks in on you

Set when Kai reaches out: Sunday night planning, mid-week recalibration, post-workout review. Consistency is the hardest part. Kai handles the nudge.

Features

Less guesswork. More signal.

Kai analyzing training data and prescribing a focused plan

Ask anything about your training

“Why did my squat stall?” “Am I doing too much volume?” Kai pulls the actual numbers from your sessions and answers from there.

Check-ins screen with templates and time scheduling

Scheduled check-ins

Pick a day and time. Kai opens a thread when you said you’d show up.

Sidebar showing coach context, check-ins, and conversation history

Everything in one place

Your goals, conversations, and check-ins all live in one tap. No dashboards to maintain, no tabs to manage.

Goals you can edit

Goals change. Kai keeps a living profile so the advice stays current.

Inline chart of bench 1RM progression rendered in chat

Charts when they help

Trends, comparisons, volume across blocks. Rendered inline, not as a separate dashboard you’ll never open.

Empty chat with example questions to start any conversation

Start anywhere

No menus to learn. Just type what’s on your mind and Kai picks up the thread, every time.

Why Kai exists

I built this because I needed it.

I train four times a week. I want to progress. But I always felt like I wasn’t training optimally, and the plans I’d find online weren’t made for me. Generic blocks, generic templates, no idea how I actually moved last week.

Consistency turned out to be the hardest part. Not the workouts themselves. The showing up, the small recalibrations, the honest conversation with myself about whether what I’m doing is still working.

Kai is the coach I wanted: one that reads my actual training data, remembers what I told it, and pings me on the days I said I’d show up.

Thymen

Get Kai

Available on iOS & Android.

Free to start. Premium unlocks Hevy auto-sync, higher message limits, and a 7-day trial to feel the difference.

Download on the App Store Get it on Google Play