It’s a well-known fact that keeping fit by regular exercise is one of the best ways to stay healthy and well. The question is, once you’ve achieved a certain level of basic fitness, what do you do if you want to get to the next level? This is where a team training program at your local gym could provide the answer. If you’re not familiar with team training classes, they involve high-intensity workouts in a group with an instructor present to encourage and advise. The exercise program is based on the principles of interval training, whereby you exercise vigorously for a short period of time, rest for an equal length of time, then exercise vigorously again.