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@hallo Agreed … cardio is the hardest to build. I found that swimming was the best but they don’t transfer well between swimming to biking to running so you still need to do at least 2 different types to really have a good overall cardio base I think the best thing for crossfit is going to be...

@hallo This … all cardio helps. I quit CrossFit for 6 months to train for a half iron man … came back to crossfit once done and I could do any workout without any cardio issues at all … but I lost all my muscle so it’s a give and take