Lactic acid traditionally has had the ill reputation of being a substance that slows down athletes. The acid is thought to weaken muscles when athletes need them the most. But a new study in the journal Science suggests lactic acid isn't the problem. NPR's Jon Hamilton reports. This feature has been edited for archival purposes on the Web because of legal rights issues.
Copyright 2022 NPR. To see more, visit https://www.npr.org.