Freegen is short for freegeneration. What that means is a no hands regeneration. You bind the yoyo in the air, the yoyo will wind itself up but the weight of the counterweight will cause the yoyo to make a couple rotations and then regenerate on its own. The key to this trick is making a mental note of how fast the yoyo is spinning when attempting this trick. You should have a medium low spin for this to work. Also, another variable is the height in which you toss the formation upward. Generally, higher is better.