Weakness and fatigue can prevent a muscle from pulling sufficiently hard to do its job.

When this happens the body starts to compensate for this weakness - it uses other muscles to assist.

Compensation usually results in unnecessary strain within the body.

Weakness in muscles that support joints can lead to instability which increases the risk of osteoarthritis and other conditions.

Muscles that do not release completely can become progressively tighter over time.

Tight muscles are uncomfortable, they restrict movement, they sap energy and they can become a source of severely debilitating pain.

Tight muscles can become another source of compensation and unnecessary strain in the body.

Poor habits can lead to ineffective use of muscles in creating posture and movement.

Compensating for weakness, injury and fatigue can create habits of poor, ineffective movement.

Declining proprioception (body awareness) can lead to uncoordinated and ineffective habits of posture and movement.

All of these can lead to unnecessary strain in the body.