the following tags are kind of confusing me:
legs_over_head
folded
knees_on_chest
pretzel_pose
legs_back
leg_holding
bend
frontbend
backbend
arched_back
yoga
gymnastics (this one is in good shape)
stretch
split
oversplit
spread_legs (no problem here)
maybe we can find better definitions for each and clean them up a bit. i also guess there should be some implications or aliases. what do you think?