The weight is directly proportional to the stamina and inverse to the power. There are three methods to lose weight inside the WR3D game. First, you need to train the character for stamina manually. The second method is to increase the stamina attribute and reduce power by editing the roster. Third, keep running more during the matches and use high flying moves from top rope and springboard attacks. Last but not least, just edit the character and change the body skin to something with six-packs. Also, change the character Body Type from Bulky to muscular.