| Perhaps since you were tired from the first set, you did not pay attention to proper form for the second. Improper form can easily allow you to do more than with strict form since you are going to be easing up on the tired muscles and allowing other muscles to take some burden that they shouldn't be taking.
Or, another theory, is the first set to failure set off a flood of adrenaline and endorphins, allowing you to push farther the second set. From experience, I must say this really does happen when you push hard and it lets you push a lot farther than you ever thought. The laughing by the second set because you were going so hard really makes me think of the rush; that's the endorphins doing their thing.
If you know you kept good form, then the second theory is likely what happened in my opinion. Of course by the third set no amount of hormones would help your dead muscles.
Last edited by limestix; Sep. 05/08 at 06:32 PM.
| 
