Paceline Labs — AI-native training tools for endurance athletes
Paceline Labs Talk to us

Toronto · New York A product lab

Training without guesswork.

We build AI-native training tools for endurance athletes — founded by competitive athletes in Toronto and New York.

Fitness across a training block Fig. 01
BaseBuildPeakTaperRace day
01

01 — Why we exist

The problem

Athletes record on a Garmin, socialize on Strava, plan in TrainingPeaks or a spreadsheet, and ask ChatGPT to fill the gaps. Four tools, none of them talking to each other. The plan is static the day it's written, so the first missed session breaks it — and you either follow it blindly or throw it out and lose the structure that made it work.

Your training data already knows what you should do next. Your tools should too.

02
02 — Product Invite-only beta

Paceline

A decision engine on top of your real training data: adaptive plans, structured workouts, and a clear why behind every session.

Connects your stack

Garmin, Strava, TrainingPeaks, and Apple Health.

Re-plans when life happens

Missed sessions, travel, fatigue — the plan adapts.

Explains every session

A clear why behind each prescription, so you trust the plan you follow.

Session structure — warm-up · 5 × work · cool-down Fig. 02
Ask about the beta Invite-only · No forms
03
03 — Method Four principles

How we build

A

Built by athletes

We're competitive endurance athletes building the tools we couldn't find.

B

AI-native, not AI-added

Purpose-built agents for data analysis, athlete profiling, planning, and safety validation.

C

Trust over features

Accuracy, reliability, clarity. Every recommendation explained, or it doesn't ship.

D

No BS

Plain language, real numbers, no hype.

04
04 — Contact hello@pacelinelabs.com

Talk to us.

We're always up for talking with serious athletes, engineers, and partners.

hello@pacelinelabs.com No forms. No waitlist.