I think there is nothing better to give you a shower than dynamic, exciting and with that feeling of action hahaha. in my case one that I always play and that is in almost all anime Mix is Shinzou wo Sasageyo!
another OP that I find simply thrilling and perfect for a quick shower is the first Op of my favorite anime SAO. Crossing field
another one that could not be missed is the OP of my favorite LiSA anime author, the OP of kimetsu no yaiba, Gurenge.
If im in the c.r and Shinzou wo Sasageyo is playing, I would feel so pressured to finish showering coz a titan might show up anytime soon, HAHAHAH.
I so love song no 2 and 3, just perfect, I can see myself playing a guitar while singing heartily with my invisible mic, lolol
HAHAHAHA that's what I feel too!
Loved the last 2! They're my favorites!