Cusco Triathlon 70.3

There's a reason 70.3 is the fastest-growing distance in triathlon, and races like Cusco's are the proof. This isn't a scaled-down Ironman. It's a purpose-built race. The 1.9km swim sends you into mild river at 20°C — comfortable — cool on entry, forgotten after 200 metres. It's long enough that a poor start costs real time, short enough that strong swimmers can build a genuine lead. The 90km bike is the centrepiece: rolling with some honest climbs terrain with 328m of climbing that never lets you settle. At 70.3 distance, the bike is where races are won and lost — 90km of rolling road demands constant effort management. The half-marathon is flat through Cusco's streets — a mercy after the bike, but 21.1km off 90km of cycling is never easy. The athletes who paced the bike correctly run through the field here. The kind of half-distance race that makes you understand why 70.3 is where triathlon's competitive heart beats loudest.