Energy drinks are a great way of getting a quick hit of energy, but they are usually very high in sugar, and hence highly calorific. This makes them a bit of a no go for diabetics and dieters, or anyone just trying to cut down on sugar in their diet. Before you resign yourself to a life of iced coffee, though, take a look at this: USN's sugar free version of their energy drink Spike.

Despite being (obviously) sugar free, Spike Sugar Free still provides the usual benefits of an energy drink, namely intense energy and focus through its high caffeine content. However, it also contains some added B-vitamins - essential for keeping your body in peak condition and making the most out of your training. So, unlike most energy drinks, Spike Sugar Free actually has some health benefits as well!

Spike is great for a kick of energy when your reserves are low, and while it's certainly not as intense as a preworkout, you can also use it if you need a bit of a boost before a training session.