Second gear

Luffy's second gear is his first method of powering up. Luffy begins by pumping the rubber flesh in his legs like a spring, which in turn forces his blood pressure to sky rocket and has a steroid effect. When in second gear, Luffy's skin because red and shiney and emits a white steam. This would kill a normal man because his heart would explode, but the rubber heart of Luffy has no such problems, but does exhibit strain. This suggests that in order to use this technique, he is shortening his life. Second gear lasts for only a short time but during which Luffy's abilities are increased ten fold. Not only does he exibit greatly increased speed and strength, but his Gum-Gum attacks become "Jet" attacks, such as "Jet Pistol". Luffy uses these Jet attacks so fast that he appears to be simply firing a barrage of air at his foes. Luffy defeats Lucci by using Jet Gatling, and Lucci is seeming bombarded with continual blasts of air, but each puff of steam is actually a fist. Second gear is Luffy's most potent weapon against foes who would normal crush him.