A new study says you need 10 hours of exercise a week. Can that really be possible?

A new study claims adults need 9–10 hours of exercise weekly to significantly cut heart attack and stroke risk — far beyond WHO's 150-minute recommendation. But experts say the study has flaws and that people likely underestimate how much they already exercise. Everyday activities like walking and gardening count, and even small amounts of intense activity can reduce mortality risk by around 30 percent.