What Ingredients Are In High-Quality Pre-Workouts?

The label on some pre-workouts looks simple enough. In other cases, it's a laundry list of difficult-to-pronounce words and secretive-sounding "blends" or "matrixes." Plus, with so many different brands and products, it can be hard to know what makes one better than the other.

Especially if you're just starting out, it's usually better to keep it simple. Here are four key ingredients to look for, and how they help you have a better workout:

1. Caffeine

Many lifters and other athletes consider caffeine their best training partner, and for good reason. "Study after study has shown that caffeine can increase alertness, sharpen focus, improve tolerance for pain caused by exercise, help burn fat, and help athletes do more work for longer periods in the gym and in sport," writes Robert Wildman, Ph.D., RD, RISSN, in the article "Boost Your Workout With Caffeine."

Caffeine gives you quick energy you can use for both endurance exercise and shorter duration, high-intensity work such as...

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