Training is just that training, not an end unto itself. Training is a mindful pursuit of specific goals intended to prepare you for competition. Any bozo can work hard. If every workout is a test of courage, a time to put your back to the wall so that you end up puking, that is not training. Training is a cumulative process. There has to be a yin and yang to what you do. Hard days followed by easy days. Adaptation takes time. If you are straining through every workout, then there is a high probability that the adaptive response will be negative. Remember one workout cannot make an athlete but one workout can break an athlete.