A person experiencing low energy may feel tired all the time and may be unable to complete basic tasks without feeling worn out or exhausted.
As men age, the amount of testosterone that their body produces naturally declines. Low testosterone and sleep apnea, can affect their performance over a period of time.
Having low stamina often causes a person to feel tired after little exertion, and they may experience an overall lack of energy or focus
When muscles are required to work harder than they’re used to or in a different way, it’s believed to cause microscopic damage to the muscle fibres, resulting in muscle soreness or stiffness.