In one sentence, describe what the following article is about: It is designed to get your heart rate up and maybe some adrenaline going which will give you a mild tunnel vision effect. Before you do a drill, with your firearm securely holstered, do 20 or more push ups. Go until you have a bit of a burn and you are getting out of breath. Jump up and do your drill as soon after as possible. You will find that acute aiming is much more difficult, though general flash sight aiming shouldn't be too much different; this is why it is so important. This becomes a problem if your pistol is resting against something or the front of the gun is pressed into something soft. A simple drill to keep the bad guy off of your gun in a close quarter situation is to put your support arm straight in front of your chest bent at a 90-degree angle. This keeps the bad guy off you, while your firing arm is lowered near your hip. For practice: a tall target you can lean up against your arm and fire into it is good (make sure the target is soft, so the bullets don't ricochet and it doesn't splinter make sure you shoot straight forward so you don't hit your arm). A couple times is all you need with this drill, just to give you the feel. Have a center-chest-sized target (10+ inches) setup 1520 yards (13.718.3m) away. Start your sprint at it, when you feel you are close enough to hit the target while moving, slow down to a crouched walk with your knees slightly bent (to keep your upper body smooth) and shoot the target. Add different things while running: have a friend tell you when to start shooting (at random times). Or start running at the same time a friend starts reloading. Have the friend yell when he is done to let you know to start shooting. It can become a reloading vs. sprinting contest (it will also give you an idea of how long a reload feels like if you need to rush someone). If your location allows, stand 1520 yards (13.718.3m) away from your target. Have another person stand well off to the side pointing at a different target. The person standing to the side will have one round in the chamber and an empty magazine, with a loaded magazine in easy access (i.e. magazine pouch). You should have your gun out at and the ready. The other person will fire; you start running at your target. When you are close enough to get good hits, you shoot; if the other person is able to reload and fire at his target before you shoot, he wins. It is best (for safety reasons) for the other person to be aimed and shooting at a target which is different direction than yours, so at no time will one person be in front of someone else's muzzle. Additionally, you can try reloading while running at the target, then shoot the target when you are done (this is the most advanced version of this drill).
Summary: This drill can be added prior to any other drill. Most semi-automatic pistols will not fire if the slide on the gun is not in battery (full-forward) position. Charging a bad guy seems like a stupid idea in most cases, but if the bad guy is reloading, or otherwise distracted, it can be of great benefit (you may be able to catch them by surprise or disarm them).

In one sentence, describe what the following article is about: Heart palpitations, chest pains, and severe abdominal pain are all signs of a serious allergic reaction. If you're experiencing any of these symptoms, stay calm. You may be experiencing a reaction that could be anaphylaxis. Get immediate treatment to avoid life-threatening symptoms such as anaphylactic shock or a heart attack. Focus on your breathing to help calm yourself down and make sure you're getting enough oxygen. If you think you may be having a heart attack, call emergency medical services immediately. Some discomfort, nausea, or even diarrhea after you eat something could just be a harmless effect of eating food that was maybe too spicy, greasy, or heavy. However, if you experience extreme nausea, vomiting, or diarrhea that won't go away after a few hours, you may be having a serious gastrointestinal reaction that needs to be checked out by a doctor to make sure it's not dangerous. Nausea, vomiting, or diarrhea could be a sign of a more serious systemic allergic reaction. Call your doctor if you're still experiencing serious symptoms 3 hours after you eat. They may ask you to seek emergency treatment. A serious allergic reaction can cause a major drop in blood pressure, which can cause you to feel disoriented or extremely anxious. If you suddenly find yourself lost and confused, or your heart is beating fast and you have anxiety, you may be experiencing the onset of a serious reaction. Pay attention for any other potential symptoms that could confirm that you need immediate medical attention. Sometimes a serious reaction caused by a food allergy can take time to affect your whole system, and your blood pressure may be affected first, which could cause you to feel anxious and confused, but otherwise normal. Keep an eye out for additional symptoms.
Summary:
Check for pain or tightness in your chest or abdomen. Pay attention to nausea, vomiting, or diarrhea after you eat. Take note if you suddenly feel confused or anxious after eating.