A person musters up the courage to do something. We have the phrasal verb 'muster something up', and I'd appreciate it if you could give me a few words I can use instead of something, with this phrasal verb, such as courage, energy, etc.
strength, courage, will, power, bravery, the nerve, energy, confidence, faith, etc
you can also literally muster up things or people: money, your friends, men, armies, etc.
anything that you can gather or summon up