I've started taking this post-workout. The first couple of days it made me feel all sorts of crazy post-workout, now I really like it. My muscles don't get sore at all now. If you take a pre-workout, I do not recommend drinking this as an intra as well; it will make feel like you can see around corners. The swoleberry flavor is great.
https://www.amazon.com/Workout-Build.../dp/B0773CCFXD