If you're exercising for more than an hour, consuming carbohydrates can help delay tiredness as well as enable higher intensity performance - an intake of 30-60g per hour is ideal.
Each 28g pack of Sport Beans (from the makers of Jelly Belly beans) contains 25g carbs, of which 76 per cent are sugars, making them ideal portable carbs to aid in maintaining blood sugar levels and allowing longer exercise.
The packs are a good size to slip in your pocket and are also simple to open with one hand if you do the tearing with your teeth, making munching on the go easier. A good thing about the beans is that there's no artificial sweeteners which makes for a tasty snack that doesn't leave your mouth feeling like you've been sucking on sticky tape. A water bottle is recommended as well as the beans to keep your fluid intake in balance, but otherwise we found these to be surprisingly effective and really quite moreish.
The only down side was the amount of E numbers in a product that purports to aid us healthy, sporty types - E102, E133 and E110 are banned in numerous European countries.