Confident, ultra-fit, competitive swimmers make fantastic divers because they are comfortable within the water and they are in good shape, but in the event the logic of this myth have been true, I suppose only Tour de France racers would ride bikes.
Diving is definitely an active sport plus the greater shape you are in, the less complicated it will be, but any healthier person with at the very least an average fitness level can do it. This myth is probably fueled by the fact that there's a fundamental swim test in the start off of scuba lessons. You are going to need to have the endurance to swim about 200 yards nonstop, but there's no time limit and it's not a race. The instructor also needs to know that you just have simple water skills and are comfy submerging your face in water. That's it. And when you take into account that you'll find divers from age eight to age 80 who have passed this grueling test of physical ability, it is fairly clear that any individual with an activity level above that of a chronic couch potato can do it. So, get off the couch and go diving already. And please--regardless of the fitness level--leave the Speedo at dwelling. OK?