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.
There is a direct correlation between your exercise intensity and the amount of thyroid hormone you produce. In other words, low thyroid levels are associated with low-intensity exercise, and as you increase your intensity level, your thyroid levels increase too. Exercise performed at the anaerobic threshold causes prominent changes in hormone values, and they continued to rise up to 90% of max heart rate [2].