I'm currently diving in Rangiroa, French Polynesia and the dives here are wearing me out. I'm female, 60, fit with 300+ dives and have started swimming at home between dive trips. I've never been good on air but over the years have learned to minimize my movement, dive slowly and slow down my breath. Then I get in situations like here where the guide speeds along and I can barely keep up without breathing hard. The other divers, usually younger, don't seem to have a problem. Are some dive locations and situations inherently faster dives? How do you choose ones that are slower paced?