with correct deep breathing, the ribs gently massage the spine and internal organs.

Blood circulation throughout the body happens via blood vessels (veins, arteries, and capillaries). There are around 100,000 miles of blood vessels in an average adult body! These lie across or underneath, or are surrounded by muscles. Relaxed muscles that are not stiff and over-contracted won't squeeze and pinch the blood vessels, meaning they transport blood more effectively.

Remain relaxed, even when you are doing exercises that may seem at first to be primarily strength building; consider all the movements to really be a stretch.

a football player who trains with weights and sprints is "conditioning" his body for playing football.

A sub 2.15 marathon runner is not "fit" to dead lift 600 pounds of iron, and a world-class power lifter is not "fit" to run a sub-28-minute 10,000 meters. Using our narrow definition, neither athlete would be "fit" to perform any number of movements on the gymnastics balance beam. The Olympic gymnast would not be "fit" for sumo wrestling, and so forth.

Strength is a muscle's ability to contract against the resistance of an external object (a weight) or one's own body weight.

Power utilizes strength within an explosive burst of energy.

Agility encompasses the possibility of executing power movements in rapidly changing directions