I agree about the kitchen, but not about the ab wheel. I tried that thing a few times. You don't need it to get good abs, since most exercises, especially compounds work the area. That's not to say that a couple of ab exercises would hurt, but why the wheel from hell?
On the matter of caffeine, and since this is a creatine thread, I read that caffeine may reduce the effectiveness of creatine.
https://www.mayoclinic.org/drugs-supplements-creatine/art-20347591