Cardiovascular exercise as it applies to Rugby players is activity involving the large muscles, such as your legs. The word 'aerobic' refers to something that needs oxygen. During cardiovascular or aerobic use oxygen gets continuously delivered to your muscles.
Players need huge amounts of muscular activity in any game. Forwards use greater amounts compared to backs because when a game stops for a scrum for instance backs line up to attack/defend and basically stand more of less motionless whilst forwards keep moving in the scum by pushing, this of course uses the larger muscles so requires more oxygen than the back at that time.
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Cardio vascular endurance is basicallyabout your stamina, how well and how long your heart and lungs can supply your muscles with enough oxygen and nutrients to keep working.
As cycling races generally are quite long - hours - cardio vascular endurance is real important to be able to keep going the whole time w/o tiring.
Cardiorespiratory endurance in sports is vital specially in discipline like soccer, rugby. There had been instances in the past when soccer players died on collison in the field due to weak heart or having heart ailment.A player with cardiorespiratory endurance can withstand such mishaps, that endanger a player's life.
So that you can go longer and harder than anybody else, making you a better player than them in any sport.
Cardio is important in soccer because it requires constant movement during the whole match. It is unlike other American sports in that there is only one break, which is at half time.