In one sentence, describe what the following article is about: Instead of breathing regularly while you swim, consider holding your breath. Do this for a certain amount of time, like 30 seconds to 1 minute. This will slowly train your mind and body. To do this:  Warm up, without holding your breath, with a 400-meter swim. Complete sets of 25-meter freestyle swims without breathing. Try to do 10 sets of these. Allow yourself 15 to 30 seconds to breathe in-between sets. Perhaps the best tool in training yourself to stay underwater is a timer. Use a timer to establish a baseline for how long you stay under. Then, time yourself every time you go underwater and try to beat your best time. After you have a baseline of how long you can stay underwater, you should challenge yourself to increase that time slowly. You’ll find that increasing the amount of time you’re underwater by a few seconds a week could have huge results over the course of many weeks or months. Set a goal of increasing your time underwater by 5% to 10% a week or a month, depending on your ability. Remember, though, it is best to focus on slow progress. Take a deep breath through your mouth. Hold it for a second. Use your mouth to exhale for 10 seconds. Make sure your mouth isn’t open very much as you exhale. Do this for a minute and a half.  You can practice breathing while in the water or while on land. Practice at least 3 times a week, until you are completely comfortable with deep breathing. By practicing, you'll condition yourself to deep breathing and be able to increase the amount of time you stay underwater. Once you've mastered deep breathing, you can train yourself to alternate breathing and holding your breath. Start by holding your breath for 30 seconds and then breathing for a minute. Do this for a given amount of time. Consider doing a 5-minute warmup workout before your breathing exercises. Try swimming or running for a few minutes. This will get your heart rate up and get you breathing faster.
Summary: Hold your breath while swimming. Use a watch with a timer. Slowly increase the amount of time you are underwater. Practice deep breathing. Alternate between breathing and holding your breath.

In one sentence, describe what the following article is about: You will not feed all of them to your dog, so they can be foods you like too. Make a show of enjoying this food, so that you've really gotten your dog's attention.The key is to make your dog desire what you're eating. This is not medicine, but a way to get your dog to expect good-old, no-medicine food. It will let his guard down. Your dog will take for granted that it wants to eat whatever falls. Other times, quickly grab the food from the dog. In this way you establish a sense that your dog must act quickly in order to snatch the food. This will encourage your dog to try to eat what you drop, without thinking. This can be hidden in food, or just by itself. Try to quickly grab it from the dog, in an attempt to trick your dog into eating it. If your dog already expects it might lose the opportunity, you may not even have to try that hard. This process works best when there are no other dogs around. There is a risk that another dog might try to take the pill this way, and so it is important to isolate the dog you want to medicate. However, keeping another dog in view, but behind a gate, in a crate, or outside, can increase the medicated dog's excitement.
Summary: Get different foods your dog likes to eat. Drop some food on the ground while you eat. Pretend not to notice that you dropped the food at first. Drop the pill. Keep other dogs away.

In one sentence, describe what the following article is about: One of the most important ways to maintain your roof is to remove any tree branches or limbs that overhang your roof. Not only will these limbs contribute to the accumulation of debris on your roof, but the shade they help create will encourage the growth of mold and lichen.  You may be able to cut smaller limbs or branches by yourself. If you have large limbs that overhang your roof, you may need to call in a tree cutting service. You should periodically remove leaves, sticks, and other debris from your roof. Accumulated debris will increase the amount of moisture on your roof and encourage the growth of mold and lichen. If you have a long broom or pole, you may be able to remove a lot of debris from the ground or from a ladder. Use a hammer to remove any nails or tacks that secure shingles to your roof or other shingles. Remove the damaged shingle. Then, tack and nail down a replacement shingle. If you’re not comfortable replacing a shingle yourself, you should contact a licensed roofer or contractor to do it for you. This solution will help neutralize the blue-black stain that occurs on shingles overtime. In the end, you’ll have shingles that appear brighter.  Be very careful using oxalic acid, as it is a toxic substance. Oxalic acid won’t keep shingles bright. If you don’t remove the source of the stain (usually iron from certain nails), you’ll have to apply it again. How often you clean your cedar shingle roof depends on the climate you live in. To determine this, you need to consider the challenges the environment you live in pose to your roof.  Cedar shingles in wet and overcast climates should be cleaned yearly. Cedar shingles in sunny and dry climates may only need to be cleaned every 2 to 3 years.
Summary:
Trim overhanging tree limbs. Remove leaves and other debris. Replace damaged or rotten shingles. Apply a 5% oxalic acid solution on your roof. Clean your roof regularly.