Bubble Gum Disorder
Bubble Gum Disorder (BGD) is a very common physical condition in the magical forests and swamps. It's believed to be caused by fluid exchange with mutagenous mushrooms and characterized by impossible stretchiness of the body, comparable only to a piece of gum.
People with BGD aren't good at lifting weights, jogging or swimming, so their only physical exercise is stretching and sometimes also... stretching XD Even their normal resting positions are usually impossible to replicate due to their very loose assemblage of limbs and bones, but when they start working out... even the world's best contortionists can't outbend them!