Always the first one to run low on air on a scuba dive? Freediving guru EMMA FARRELL offers helpful advice on ways to increase your SAC rate – and extend your dive-time.

You know you’re a gas guzzler when you use a twinset for a 40-minute dive, or when you’re always the first one out of air. Men more than women tend to be guzzlers, and newbies more than experienced divers. However, it is possible to teach people how to use less air on a dive, and the benefits extend far beyond a longer dive-time.