Playing in the pool is great for building confidence, co-ordination and for practising breath-hold. Concentrating on a task helps to distract the mind from the urge to breath. Noah demonstrated an underwater Limbo exercise which is a good way to practice balancing buoyancy: The weights must be held in the right position to offset the buoyancy of the air in the lungs. As a training exercise, it is good to go slowly in order to extend the breath-hold while concentrating on position and co-ordination.