Cardiovascular fitness (also known as cardiorespiratory fitness) is the ability of the heart, lungs and vascular system to deliver oxygen-rich blood to working muscles during sustained physical activity.
Muscular strength is the amount of force a muscle or muscle group can exert against a heavy resistance.
Muscular endurance is the ability of a muscle or muscle group to repeat a movement many times or to hold a particular position for an extended period of time.
Flexibility is the degree to which an individual muscle will lengthen.
Body composition is the amount of fat in the body compared to the amount of lean mass (muscle, bones etc.).