I have A LOT of anger...how can i help this?

i had a dream last night and it made me realize how much anger i have towards my family, particularly a step-sibling. in my dream i just kept punching this person and yelling at them, and yelling at everyone and it just felt so good to get the anger out. i don't act on my anger in real life, i am a very calm person and i think that's part of what contributes to my anger. i have no way to get it out in a healthy way. what's a good way to get the anger out of my system? i was thinking about maybe getting a punching bag or taking kickboxing, are there any other suggestions?