The summary is:
KUN and HENDERY are two friends who try free diving for the first time with a professional instructor. They learn different breathing techniques, how to equalize their ears, and how to dive deep into the water without any equipment. They also have fun racing with flippers, holding their breath, and making poses underwater. They share their feelings and thoughts about the sport and thank the instructor for his guidance.
1. Two people, HENDERY and KUN, are participating in a free diving experience.
2. They are learning four types of breathing techniques for diving.
3. The breathing techniques include "preparation breathing", "final big breath", "Static Apnea", and "recovery breathing".
4. Preparation breathing involves exhaling longer than inhaling.
5. The final big breath is the breath taken right before going into the water.
6. Static Apnea is a breathing technique that involves relaxing as much as possible.
7. Recovery breathing is a technique used after holding one's breath for a long time.
8. Inhaling fast and holding one's breath for a second is part of recovery breathing.
9. Exhaling slowly after recovery breathing is important to avoid dangers.
10. The teacher, Instructor Kim Min Gu, can hold his breath for about 6 minutes.
11. KUN's record for holding his breath is 1 minute 27 seconds.
12. HENDERY's record for holding his breath is 1 minute 35 seconds.
13. They are learning how to equalize the pressure in their ears while diving.
14. They are practicing "Duck Diving", a technique for going into the water.
15. HENDERY had trouble equalizing the pressure in his ears at first, but later improved.
16. They are trying to dive as deep as possible without holding a line.
17. They are making fun movements and poses while diving.
18. Instructor Kim Min Gu is impressed with their progress, saying they are the first students to reach the bottom of the pool on the first day.
19. They are taught to always stay with a partner and check each other's safety while diving.
20. The experience is considered a fun and cool way to stay safe during summer.