Hey Guys!!I am new to freediving and spearfishing(still learning the basics)i start freedive 3 months ago.also i swim in a pool to improve my technique.But when i full inhale in the pool i cant stay under water.and when i exhale(no air in lungs) i stay underwater but havent oxygen to stay enough time.i saw some champions stay underwater in a pool and make a dynamic 200 meters!!what can i do for that?