Should I not go to the gym if I have sore muscles from the previous days workout? Can it cause injury? It's group fitness so I can't choose what I do to avoid the pain.

when progressive overloading how much should the weight increase per week

I took preworkouts 3-4 times a week (out of my 6 gym days) at half scoops. I felt un-motivated and actually sad when I didn't take it. Can it cause addiction? I've since weaned right off it. I drink coffee instead.

https://www.tiktok.com/@kalefuller_fitness/video/7450922759590317330?lang=en

https://www.tiktok.com/@kalefuller_fitness/video/7501235438556925192?lang=en