Best Warm Up Routine?

I've been trying to play more ranked lately but it's hard to get to my highest level of competence on week days when I feel tired in the afternoon. Normally I just play soloQ games on my Plat 2 smurf ( my main is d4) to try to get on my best level, but I don't always feel like I'm performing that well. What are some routines you guys go through to warm up your mechanics and get in the zone? :)