Actually it is the chronic cardio folks who might benefit most from lower carbs. Many ultramarathon runners and trail runners find adopting a low carb diet to be like a secret weapon in their training. They train their bodies to run on fat so that on race day they have more even energy and don't need to consume as many calories during the race. Many long distance runners struggle on race day with vomiting and diarrhea from consuming calories during the race and being better able to use their fat stores helps. They also tend to consume a lot more carbs on race day, which they call "train low, race high."
It's the intense stuff that seems to require more carbohydrate, such as chronic cross-fit (just kidding) or lots of heavy lifting and sprinting. I found that when I took up lifting I needed more carbs than before. But not a lot more. I just started having a sweet potato every day for lunch and sometimes another for dinner.
Female, 5'3", 49, Starting weight: 163lbs. Current weight: 135 (more or less).
Starting squat: 45lbs. Heaviest squat: 180 x 2. Heaviest Deadlift: 230 x 2