Quick Answer. In an officially-sanctioned MLB baseball game, there are 9 innings. If the home team is ahead in the top of the ninth and earns 3 outs, the game ends at 8 1/2 innings. If the game is tied after the away team earns 3 outs in the bottom of the ninth, the game goes into extra innings. Keep Learning.
When you exercise, the muscles you use require more energy. When exercise can be sustained, this demand is met primarily by aerobic means. Aerobic energy production in muscles results in increased gas exchange at the lungs, because more oxygen is taken in and more carbon dioxide is released.
The heart rate during exercise is an indicator of intensity, or in other words how hard you are working. As you get fitter, your heart rate should decrease for any given exercise workload. This is the basis of many of the submaximal aerobic fitness tests.During exercise, your heart rate will depend on the intensity of exercise, your fitness level, and your maximum heart rate (which may also depend on your age).Some training programs set the intensity of exercise using heart rate guides.he heart rate during exercise is an indicator of intensity, or in other words how hard you are working. As you get fitter, your heart rate should decrease for any given exercise workload. This is the basis of many of the submaximal aerobic fitness tests.