Men need twice as much exercise as women to lower heart disease risk

This is an observational study and, like all such studies, has limitations regarding actionable recommendations. Additionally, the study shows that women already have lower baseline risk, meaning the exercise benefit differs between sexes. The claim relies on a single figure where the model's margin of error is considerably large, making the specific assertion about doubling exercise inconclusive. However, the data demonstrating sex-based differences in cardiovascular disease risk is robust.