I'm creating a fictional universe in which several races exist that are very different from each other due to long term separation. One race is specialized for archipelagos and more specifically, diving. Not super fast swimming, but more of a diving and running type of thing. They will be subjected to several variables which will change their physiology. My question is this: what adaptations might said race develop based on the following variables?
-A gym in which long distance running, gymnastics, and diving equipment can be used
-An environment in which going underwater is required to get food
-A warm, humid climate where it rains often, where excess mass is not necessary
-A culture where intelligence and skill is admired most
-An ancestry of Indonesian, Polynesian, and Australian descent
Give me details. Hair color, eye color, skin color, height, weight, other adaptations, are all welcome.