Final answer:
Excessively intense exercise without adequate rest can lead to rhabdomyolysis and other injuries. Lifting improperly or too much exercise can damage muscles, and tendons, and even cause heart issues or menstrual disruptions in women.
Step-by-step explanation:
It is not recommended to engage in extremely intense exercise without proper rest and conditioning due to the risk of injury, including muscle, tendon, and bone overuse injuries, as well as a severe muscle condition known as rhabdomyolysis. This condition involves the breakdown of muscle tissue, leading to the release of a protein called myoglobin into the bloodstream, which can damage the kidneys. Factors that can contribute to rhabdomyolysis include direct muscle injury, certain drugs and toxins, such as some nonsteroidal anti-inflammatory drugs (NSAIDs), aminoglycoside antibiotics, and statins, as well as excessive physical activity. Improper lifting techniques, such as lifting with the back instead of the legs, can also cause significant muscle strain and spine damage. Additionally, over-exercising can lead to heart scarring, rhythm abnormalities, and in females, amenorrhea, indicating that the body's limits are being exceeded.