Energy balance also has to do with whatâs going on in your cells. When youâre in a positive energy balance (more in than out) and when youâre in a negative energy balance (more out than in), everything from your metabolism, to your hormonal balance, to your mood is impacted.
Muscle injuries are very common in both professional and recreational athletes. They typically occur in muscles that cross two joints, during explosive activities such as sprinting, and when the athlete is suddenly increasing their exercise regimen (i.e., training camp).
The impact forces of running make our bones stronger, however, our bones can only adapt at a gradual rate. That is why you may get a stress fracture from increasing your mileage too quickly from 20 to 40 miles per week, but a few years later may handle 60 miles per week with no problems.