First of all, there is no such name as a gear, generally we call it normal Luffy, that is, Luffy who naturally exerts the ability of rubber fruits, and the use of moves in this state of Luffy will not consume life.
The second gear began to consume life, which was in the water capital and CP9 agents against the moves that had to be developed in order to keep up with the speed of the other side, leopard Luke quickly discovered the principle of Luffy's move, using the characteristics of the rubber body to continuously compress blood vessels, so that the blood flow rate accelerated Metabolism accelerated, and the whole body emitted heat to reach an amazing speed. Lu Qi was a very conceited person, he felt that Luffy was an evil road cultivation method, and said to Luffy that the human and animal system that used physical skills to fight was the best. However, the fruit can not be changed, Luffy can not be replaced by animal lines, can only be researched and developed in rubber ability, Luffy also has a sense of self-confidence, thinking that his ability is the best, most of the ability is like this, without this confidence it is difficult to develop ingenious moves.
When Luffy is in the second gear, Lu Qi can still play a draw with it, when Luffy decides to open the third gear, Lu Qi is passive, his animal ability is not an esper species, there is no special ability, only body bonus, and the body size adjustment is his physical move to return his life, not the fruit ability. Luffy's third gear is to inflate the body to achieve local giganticism, which is a challenge to the body's ability to withstand, and after using this move, the body will rebound and become super small.
Later chapters of the battle, Luffy second and third gears are often used, although not to mention the cost of life, we can not forget, unless the author changed the setting, otherwise this side effect is always there. Luffy's most life-consuming time was not to develop skills, but to save his brother from breaking into the big prison and being eroded by Magellan's poison, Von Kray dragged Luffy to Ivankov, and Luffy had the possibility of surviving.
Because Magellan's poison is too terrible, Ivankov's fruit ability is against the sky, and if he wants to save Luffy, Luffy also has to pay a price, the price is life, and he may not be successful. In Ivankov's words, it was a miracle that Luffy survived, where he spent at least ten years of his lifespan, and finally Ivankov told Luffy that he must not be poisoned by Magellan again.
The fourth gear is the ultimate move that Luffy has cultivated on the island to develop on his own, the maintenance time is short, once it is over, there will be a ten-minute weak period, and Luffy has no mobility at all during the initial weak period, and can only let others escape on their backs. Although Oda did not say whether the fourth gear consumes life, I think it is consumed, the fourth gear does not say that the body type must also be blown up, but also covered with the full body armed color, which is a great test of physical endurance and physical fitness.
Text: Dragon Knight Sharu