If you mean “energetic work”, this is done by both Twin Flames because they are two in one.
Twin Flames have a oneness that is only distinct to the couple. Each Twin Flame pair has a unique energy vibration frequency.
If you would like me to interest you about how the energetic work goes, it is a personal battle from within the self.
The work is done by learning to cleanse your energy. Before you met your Twin Flame, you were a different person and after you met them, you become someone new.
Anyway, the most difficult phase is when you need to Hug your inner child. When you need to embrace your Pain so that you can clean it out of you. You get to face yourself by changing everything about you.
When you are with your Twin Flame, you are your authentic self therefore, you must STAY your authentic version whether you are together or in physical separation from your Twin Flame. Try Self-Love or Surrender.
So the energetic work that you do is for your good but it benefits your Twin Flame because you are a single energetic unit.