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).
Step 2: How do injuries occur? A hamstring strain is considered a sprinting injury although it can also happen during powerful kicking. Stain injuries are predictable. They occur in muscles that have a complex design (some simple muscles look like the straight parallel grain of wood while other more complex muscles look more like a feather.