Article: Only an experienced operator should attempt to dig a trench with a machine. These machines are very physically demanding, and can be extremely dangerous for an unskilled user. All ordinary trench safety precautions apply as well. This includes calling 811 or another utility location service before you begin, and having plans to shore up the trench walls if necessary. Choosing a machine will depend on your budget and the size of the desired trench. Plotting the route of your trench with highly visible marking paint and thinking about the depth of your trench will help you determine the best trencher for your job. Most projects will only require a walk-behind trencher. Walk-behind trenchers can dig up to 3 feet deep and between 4-6 inches wide On average, a ride-on trencher can dig up to 7 feet deep and about 13 inches wide. Ride-on trenchers are the largest available commercially, but due to potential safety concerns, these are usually only rented to professionals. You can contract a landscape company that installs sprinklers or a utility installation company to use this tool on your behalf. Most hardware stores will allow you the option of renting a machine for a few hours, a day, or even a week. Unless you have considerable trenching to do, or unless you have future projects requiring a trencher, renting might be the best option for your project. Trenchers cost anywhere between $900 and $1 million to buy, and at least $70 to $200 to rent for a day or two, plus the cost of transport. You may also find a more affordable trencher through online services, like Craig's List or eBay. If you decide to operate a trencher, you might consider taking a free trench safety class. The main points you want to keep in mind are the stability of your trench, your footing, and the consistency of the soil, which will influence the effort you and your trenching machine will have to exert. Rocky soil or roots can cause stones or grit to become airborne, so it is recommended you wear safety glasses while operating your trencher. There is also considerable danger from the rotating digging chain, and from the risk of the heavy, powerful machine getting away from you. Each machine will be different, but most will have an ignition switch, a choke, and an engagement lever, which you will manipulate to control the trencher. Due to variations in make and model, it is safest to familiarize yourself with operation manuals before use. If you have rented your trencher, do not leave the rental yard without a demonstration of the machine's operation, including a check that all safety and shut off switches are working properly. You should also have access to a copy of the manual, although you may be able to find this online by searching for the make and model information. Be sure to keep all other people and pets far away while the machine is running. During operation, if you need to clear debris from a stuck chain or trench, or leave the machine for any reason, always shut off the machine completely. Never leave the machine running while you are not operating it. Even if the chain is disengaged, the machine can cause severe injury or death. You'll want to double check that your path is clear, but now that you're aware of the basic functions of your trencher, turn on the ignition, pull out the choke, and position the digging chain where you want your trench to begin. Pull the engagement lever/switch (depending on model) and walk slowly backward along the trench path you have plotted. As operating this machine requires you to walk backward, be careful not to trip and hurt yourself or do damage to your trenching machine. Large roots or stones might have to be cleared by hand. If your trencher stops for an unknown reason, turn the machine fully off, remove it from your trench, and explore with hand tools, clearing any obstructions with your shovels, Pulaski digging tool, or pruning shears.
Question: What is a summary of what this article is about?
Evaluate your abilities. Consider the machine you will need. Decide to buy or rent the machine. Take safety precautions. Learn to properly operate the machine. Do not run the machine with people nearby. Position and prime your machine. Engage your machine and trench.

Problem: Article: You can do this on the bare floor, but you'll be more comfortable if you use a mat, as it provides a bit of padding. However, avoid doing it on something like a bed, which has too much padding without enough support. Place your arms by your sides and your palms face down on the mat. Bend your knees and place your feet flat on the floor, ready to lift them off in a moment. Take a breath and bring your legs up so your knees are above your hips. They should be bent at 90-degree angle at this point. Then, draw your heels toward each other. Point your toes and push your legs out and up, straightening them out as you do. Make a 65-degree angle with the ground. As you lift your legs, bring the top of your body up, too. Draw your head and shoulders off the ground, bringing your chin down toward your chest. Pretend you're looking at your belly button, and that will help you get in the proper position. Make sure you're tightening your core muscles by pulling your stomach muscles in. While holding your head and legs in the air, move your arms up and down in the air. Keep your arms straight and your palms pointed toward the floor. This movement should be fairly vigorous, as it's meant to get your blood flowing. Aim for moving your arms at least 5 inches (13cm) up and then down. Breathe in through your nose and out through your mouth. Count out 5 breaths in and 5 breaths out, pumping your arms the whole time you're moving. Try to do 1 pump each time you breathe in and 1 pump each time you breathe out. After 5 breaths, bring your legs and head to the floor to rest. The name of the exercise comes from the fact that you're breathing in 5 times and breathing out 5 times multiplied by 10 to equal a hundred. Technically, you're supposed to pump your arms 100 times, doing 1 pump per inhalation and exhalation.
Summary: Place a yoga mat down on the floor. Lie down on your back, centered on the Pilates mat. Lift your legs above your hips and then push them straight out. Lift your head and chest. Pump your arms up and down. Breathe in and out 5 times while you pump. Do the exercise 10 times.

Start by removing all bedding from the waterbed. This includes removing mattress pads, sheets, comforters, pillows, and everything else. Ultimately, you won't be able to drain the bed without stripping it. After stripping your bed, take a few towels and place them around the waterbed. You may also want to position a few around the ends of the waterbed mattress so they can catch any water that spills. Keep extra towels around in case you have a spill larger than you anticipated. Go behind the bed and unplug the waterbed heater and any other plugs that might power some aspect of the bed. Without unplugging the waterbed, you could damage it or put yourself in danger. The fill-and-drain valve is the valve you use to fill or empty your waterbed. This valve is very often located toward the foot of the bed. It may be in the center, or it may be toward one side. After you find the valve, remove the cap from it. Push out as much air as you can from the mattress. Take a light broom and sweep from the top end of the mattress toward the valve. Remove as much air as you can, as air will slow down and complicate draining the bed. By placing the cap back on the valve, you'll stop air from getting back into the mattress. Make sure you tighten the cap so water doesn't get out, either.
++++++++++
One-sentence summary --
Strip your bed. Place towels at the foot of your bed. Unplug the waterbed. Find the fill-and-drain valve. Empty extra air from the mattress. Place the cap back on the valve.