Studying for anything and actually doing well on it!! I recently after not being in school for the last 9 years had to go through some vigorous exams for my employment. Nothing to ridiculous but enough that I had to dedicate multiple nights and weekends to my studies and therefore away from my free time which I'm not a fan of. Ending up completing both exams successfully and have never felt better. No better feeling then working hard for something and actually attaining it!! Small HEATER but a HEATER none the less!! BINK!!
p.s. Actually get to keep my job now! :)