Endurance against the force.
Physical exercise increases and endurance, and strength. Aerobic exercises (developing endurance) strengthen the cardiovascular system. A stronger heart pumps more blood per contraction and tired later weakened. Fortified vessels supplied to the muscles more blood more efficiently introducing them to the decay products. Many consider the endurance of the cardiovascular system as the foundation of good health.
These exercises burn a lot of calories. You will spend energy, performing rhythmic and energetic movements, involving large groups of muscles. Good complexes aerobic exercise include walking, jogging, jumping rope, cycling, swimming, cross-country skiing cross country and such interactive sports such as tennis, basketball and racquetball courts.
Exercises designed to develop strength (anaerobicheskie, vol. E. "Without air"), build muscle and shape the body. Instead, the rhythmic contraction and relaxation of muscles are working intensively on the resistance efforts. Growing tension reduces blood flow rather than increases it. Fatigue occurs rapidly, so these exercises, you will not be able to perform for a long time. When the blood circulation decreases, the reflex is rapidly increased blood pressure.
That is why doctors warn hypertensive or cardiovascular disease from even moderate lifting weights or doing isometric exercises. Strength increases the ability to perform a variety of activities, some of them allow you to get more pleasure out of life.
Athletes of the past generation, mainly engaged in aerobic (track and field) sports studiously avoided weight training, following the theory that the development of muscles reduces its functionality. We now know that in fact the opposite is true: intelligently selected exercises with weights play an important role in athletic training, particularly in the development of lean muscle mass.