Apnea is more than just a physical skill--it is also mental. So, yes, kapoy siguro cya pag wala ka'y sakto nga training and mindset. The number one thing about apnea is, you have to be totally calm, otherwise, stress and panic will destroy your concentration and ability to hold your breath longer. It can also be very dangerous--again, proper preparation, mindset and skills are necessary.
-RODION