Jefferson curls similar exercises

Hi everyone ,today i tried first time this exercise and feel a big difference with me flexibility pike stretch i think and mobility 
me question is there more execises like jefferson curls or Weighted Shoulder Flex Pull were you use weight  for mobility/flexibility and use the same principle ?
i know that with this type exercise you dont gone build crazy flexibility but its good use it and mix it from time to time 

Ps sorry for my bad english

HI Andrius, the front split stretch course covers all you necessities.