It's not a pre, but someone suggested it to get up for a workout. It's a very potent weight loss supplement. The crazy thing is that you're actually suppose to take 4 a day.
What do you use? It seems the most popular is C4.
I like C4 it tastes really good. I like the tingly feeling it gives you too. If you're a costco member you can get a 2 pack for 38 bucks (normally 30 a piece), im in SoCal though so yours might not have it