"Am spent" is a way of expressing that you are exhausted or have used up all of your energy. The antonyms for this phrase include rejuvenated, reenergized, refreshed, revived, and invigorated. If you feel tired, you can exercise or take a nap to feel rejuvenated. To become reenergized, you can have a cup of coffee or a healthy snack. Being refreshed can come from taking a walk outside or listening to music. To feel revived, you can take a break from work or do something fun. Finally, being invigorated can come from engaging in a new hobby or spending time with loved ones.