@decode.video on Instagram: "The post features a video of a professional swimmer at Tenerife Top Training performing a seamless underwater dolphin kick glide after a dive, covering significant distance with minimal surface disturbance in a high-tech flume pool. This technique demands exceptional core strength, ankle flexibility, and anaerobic endurance, as peer-reviewed studies in swimming biomechanics show it generates up to 20% more propulsion efficiency than surface kicking but risks hypoxia