Unsplash License (https://unsplash.com/license) — photos may be used free of charge, including commercially.

hero.jpg     https://unsplash.com/photos/man-riding-bike-on-road-during-daytime-1541625602330
peloton.jpg  group ride (Unsplash)
road.jpg     road bicycle (Unsplash)
strength.jpg gym / strength (Unsplash)
recovery.jpg bedroom / rest (Unsplash)

No endorsement by the photographers or Unsplash is implied.

Charts: zero-dependency inline-SVG renderer (static/charts.js, first-party).
Fonts: Inter v4.1 (SIL Open Font License 1.1, https://github.com/rsms/inter),
  Space Grotesk v2.0.0 (SIL Open Font License 1.1, https://github.com/floriankarsten/space-grotesk).
  Self-hosted variable woff2 files at static/fonts/.