Obey the Signs of Overtraining

From Human Kinetics

No device can measure your recovery status and readiness to train hard any better than your own body can. When your body is poorly recovered from recent hard training, you can always feel it. And when factors outside of your training, such as lack of sleep or job stress, compromise your capacity to perform, you can always feel that. Before you even lace up your shoes, you know that you’re not going to have a good day because of the heaviness, sluggishness, soreness, or low motivation you feel. Your body itself is an exquisitely crafted piece of technology whose primary function is self-preservation....It’s important that you learn to recognize these symptoms and get in the habit of obeying them.