Self-control is trainable and is applicable to learning and practicing many skills. Small, short and regular training exercises such as writing with your non-dominant hand to write or striving to maintain your posture can be a first step to build it up. (See "Can self-regulatory capacity be increased?" in Heatherton's paper at http://www.dartmouth.edu/~thlab/pubs/11_Heatherton_Wagner_TICS15.pdf.)