British researchers found that drinking refrigerated water increased exercisers’ energy levels, especially in hot-weather workouts. Athletes who drank chilled water during exercise worked out 25% longer than people drinking the same amount of room-temperature water. Those participants also claimed their workouts felt easier. Fill your water bottles with cold water right before training in the gym ready for sipping before and during your training session. It will help keep your core body temperature down and your energy up so that you can perform your best and maximise your calorie burn.