"Overloading" is a term that means "doing more than a system is used to doing". If you are ready to increase your workout to achieve a new level, you will need to overload your system by increasing the amount of weight, the number of repetitions or by adding new exercises. Regardless of whether you are adding weight, time, distance, repetitions or speed, never increase by more than 10% of what your body was previously used to. Overloading more than 10% will increase your risk of injury and can be counterproductive to your training program.