pace2fit

Generate Garmin FIT workout files from a simple text description.

A public instance is running at pace2fit.eu -- no install required, just open the page, type a workout, and download the .fit file.

pace2fit generate 'warmup@6:00,3x(8min@threshold+2min@easy),cooldown@6:30' -o workout.fit

Quick start

No install needed -- run directly with uvx:

uvx pace2fit generate '10min@Z2'

Or from the git repo directly:

uvx --from git+https://codeberg.org/Solal/pace2fit pace2fit generate '10min@Z2'

Install

Requires Python 3.10+.

uv sync

Or install as a tool:

uv tool install .

Usage

Generate a workout

# Simple zone workout
pace2fit generate '10min@Z2'

# Structured workout with intervals
pace2fit generate 'warmup@6:00,3x(8min@threshold+2min@easy),cooldown@6:30' \
  -o thursday.fit -n 'Thursday Threshold'

# Distance-based
pace2fit generate '5km@5:30-6:00' -o easy_run.fit

Options

pace2fit generate [OPTIONS] WORKOUT

Arguments:
  WORKOUT    Workout description string (required)

Options:
  -o, --output PATH    Output .fit file path (default: workout.fit)
  -n, --name TEXT      Workout name (default: the input string)
  --unit [km|mi]       Pace unit (default: km)
  --help               Show help and exit

Web interface

Start a local web UI for writing workouts in the browser:

pace2fit serve
pace2fit serve --port 3000

Open http://127.0.0.1:8000 in your browser. The page includes a DSL syntax cheatsheet with clickable examples. Dark mode follows your OS preference.

DSL Syntax

A workout is a comma-separated list of steps:

warmup@6:00, 10min@Z2, 3x(8min@4:30+2min@6:00), cooldown@6:30

Durations

Syntax	Meaning
10min	10 minutes
30sec or 30s	30 seconds
5km	5 kilometres
400m	400 metres
warmup	Open duration (lap button), warmup intensity
cooldown	Open duration (lap button), cooldown intensity
open	Open duration (lap button)

Targets

Targets are specified with @ after the duration.

Pace targets (min:sec per km):

Syntax	Meaning
@5:30	5:30/km (auto-creates a +/-5s range)
@5:00-6:00	Pace range from 5:00 to 6:00/km

Heart rate zones:

Syntax	Meaning
@Z1 .. @Z5	HR zone 1 through 5

Named pace zones:

Name	Pace range
easy	6:00 - 6:30/km
recovery	6:30 - 7:00/km
tempo	5:00 - 5:15/km
threshold	4:30 - 4:45/km
marathon	5:00 - 5:20/km
hm	4:40 - 4:55/km
interval	3:45 - 4:15/km
repetition	3:30 - 3:45/km

Repeats

3x8min@threshold           # 3 repeats of a single step
3x(8min@5:00+2min@6:00)    # 3 repeats of work + recovery
4x(1min@Z4+1min@Z2+30s@Z5) # 3 steps repeated 4 times

Full examples

# Easy 30 min run
pace2fit generate '30min@easy'

# 10k tempo
pace2fit generate 'warmup@6:00,10km@tempo,cooldown@6:30' -n '10k Tempo'

# Classic threshold session
pace2fit generate 'warmup@6:00,3x(8min@threshold+2min@easy),cooldown@6:30'

# Track intervals
pace2fit generate 'warmup@6:00,8x(400m@Z5+400m@Z1),cooldown@6:30' -n 'Track 400s'

# Pyramid
pace2fit generate 'warmup@6:00,2min@Z3,4min@Z4,6min@Z4,4min@Z4,2min@Z3,cooldown@6:30'

Output

The generated .fit file can be loaded onto Garmin devices or uploaded to Garmin Connect as a workout.

Development

# Install dependencies
uv sync

# Install pre-commit hooks
prek install

# Run tests
uv run pytest

# Run tests with verbose output
uv run pytest -v

# Run all hooks manually
prek run --all-files

This project uses prek for pre-commit hooks. Hooks run automatically on every commit and include ruff (lint + format), pytest, and basic file hygiene checks. See prek.toml for the full configuration.

Deploying

pace2fit can be self-hosted using Docker behind a reverse proxy.

Prerequisites

• A server with Docker installed
• A reverse proxy (e.g. Caddy) with a domain pointing to your server

DNS

Add an A record for your domain pointing to your server's public IP:

@       IN      A       <your-server-IPv4>

Build and run

git clone ssh://git@codeberg.org/Solal/pace2fit.git
cd pace2fit
GIT_COMMIT=$(git rev-parse --short HEAD) docker compose up -d --build

This builds the image and starts the container on 127.0.0.1:8000.

Caddy configuration

Add a block to your Caddyfile:

pace2fit.eu {
    reverse_proxy localhost:8000
}

Then reload Caddy:

sudo systemctl reload caddy

Caddy automatically provisions HTTPS via Let's Encrypt.

Updating

cd pace2fit
git pull
GIT_COMMIT=$(git rev-parse --short HEAD) docker compose up -d --build

Dependencies

• fit-tool -- FIT file encoding
• typer -- CLI framework
• FastAPI -- Web interface
• Pico CSS -- Minimal CSS framework