🏊 Fitness Swimming: Drag, Efficiency and Energy (2D)

Interactive 2D side view of a swimmer with a live power curve: drag the hips to change body angle (and drag), or drag the effort line on the power-speed chart. Speed follows the balance between useful power and active drag, with stroke rate, VO2, energy cost per metre and anaerobic fatigue.

2D · HTML5 Canvas 2D · 60 FPS target · runs fully client-side, no install