Because your body never lies. If you are having vague feelings that your heart is not beating correctly or that you are dizzy, that's a true condition. Pay attention.
It is important to listen to your body when playing sports because your body can become dehydrated or too tired. These could cause you to pass out. If you feel thirsty, drink water. If you're tired, take a rest.
while this may be true second hand smoke is far deadlier then directly smoking they have been mixed with nicotine and chemicals you would find to clean windows with etc such as appliance cleaners etc
The most important shoulder muscles are the four rotator cuff muscles - the subscapularis, supraspinatus, infraspinatus and teres minor muscles - which connect the scapula to the humerus and provide support for the glenohumeral joint.