Doing regular exercise for 12 weeks helped improve heart and lung fitness in obese black South African women, as measured by their ability to use oxygen during exercise. This finding is from the abstract summary - full study details were not available

After a tough weight session, women tend to breathe harder during their cardio workout than after an easy weight session or no weights, but men don’t show this difference as clearly.

Doing short bursts of intense exercise for 12 weeks doesn't improve the maximum oxygen your body can use during exercise in people with excess body fat, even though they can exercise longer before getting tired.

After doing 8 weeks of intense interval exercise, young men can breathe in about 5% more oxygen per minute, but taking an ashwagandha supplement doesn't help any more than a fake pill, and because they might gain a little weight, their oxygen use relative to body weight doesn't really improve.