Comparing finishing a mountain stage in the Tour de France to running a marathon highlights the distinct physical and mental challenges each presents. A mountain stage in the Tour de France demands immense endurance, strength, and cycling expertise as riders tackle steep, grueling ascents and rapid descents across rugged terrain, often contending with varying weather conditions and altitude changes. The stage requires not only exceptional cardiovascular fitness but also the ability to sustain high power output over prolonged periods, often with a heavy bike and gear.