You can simply opt for HIIT routines. These routines include sprints and in nature are short workouts. So you will not need to spend 2 hours in the field or in the gym to lose weight. When it comes to weight loss, diet and perseverance is key. This means that you should try to stick to the same routine as much as possible and not miss workouts. You can still have days off, but try to do some other form of exercise on those days. Moderate exercise is the best way to get the most benefits from your workout.