Originally Posted by Steve Shafley
You don't get better at running, swimming, or biking by doing short metcons, or even long metcons.
Depends on the level of conditioning the person is at. If it's anywhere near elite level, no way. Below that, it hcan elp. Untrained people can get better at just about anything with almost any aerobic exercise.
Improvements in VO2Max, strength, and muscular endurance may not have great carryover but there is some
carryover, which will work up to a certain point. I'm sure Lance Armstrong would agree, having done very little running training before putting up a 3 hour marathon. I've met a couple rowers who did no running and yet could run a pretty fast 1-2 miles.
I agree that metcons should not be the basis of an endurance program, however.