Energy Endurance Supplement help!

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Hi guys, I've been having a hard time lately mustering up energy to work out after a long day at work. Usually after working 8-9 hours in the office (sitting on my *kitten* all day!) I feel even lazier and I just don't have any energy. I've heard of energy supplements like C4, Thermovex, and some others that do the job... Any tips on some good pre-workout energy supplements? I just want to be able to have energy when I go to the gym after work :yawn:

and p.s.: I don't mean Redbull or one of those unhealthy Monster Drinks.