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.
If you can squeeze in even 5-10 minutes, it will help to maintain your current fitness level. Cardiovascular endurance improves when you exercise in an aerobic training zone that elevates your heart rate to somewhere between 60 and 80 percent of your maximum heart rate. To find your MHR, subtract your age from 220. Your true MHR should fall within 12 beats above or below this number.