To avoid stress on your elbow and tendons, you should invest in a lightweight racket that is comfortable and has a flexible shaft. Look for a mid-size or oversize racket with flexibility, as the flexion will help to absorb some of the shock of the ball as you hit it and put less stress on your elbow. Your strings should be strung at a tension of less than 55 lbs. Tight strings can increase the stress on your arm as you hit the ball. If possible, you should also opt for thinner strings, rather than thicker strings, on your racket. Thinner strings are more elastic and will absorb more shock caused by hitting the ball. Avoid playing with old, wet balls as they can require more force and effort to hit, leading to higher stress placed on your arm. Go for new, pressurized tennis balls whenever possible.
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One-sentence summary -- Use a lightweight racket with a flexible shaft. Make sure your racket strings are not too tight. Play with dry, light balls.

Q: The best way to avoid a collapsed vein is to eliminate the behavior that causes them.  It can be hard to quit using drugs, especially if you’ve been using for a while.  Fortunately, there are resources available to help you quit.  Start by taking the first step and asking for help. If you have decided not to quit, there are steps you can take to make intravenous drug use less dangerous. Foremost, find a needle exchange program in your area and use it. Used needles with blunted ends are one of the most common causes of collapsed veins. Collapsed veins are often the result of repeated vein trauma in the same area.  Avoid regularly injecting in the same site. Never inject into a site that is visibly swollen or bruised. Veins in your hands are small, and will collapse easily.  Similarly, injecting into veins in your groin can cause especially dangerous circulation problems. Dirt and other debris can enter your vein and cause irritation that may lead to collapse. Accordingly, wipe down the area you will inject as well as the needle before use. There are many aspects of non-medical intravenous injections that can be dangerous.  For instance, a tourniquet should never be tied too tightly, and a needle must be removed slowly after injecting.
A: Get help quitting intravenous drug use. Exchange your needles. Do not repeatedly use the same injection site. Avoid injecting into your hand or groin. Clean the area and the needle before injecting. Perform injections slowly and carefully.

Article: Don't try to break out the skinny dipping at the beginning of a party or gathering.  Instead, let things wind down a little bit.  Wait until after everyone's arrived, eaten and had time to mingle.  When the mood seems mellow, get ready to bring up the topic.  You’ll probably also want to wait for the sun, too. Sunrise, sunset, and when the moon is high in the sky are all great times to skinny dip. If you’re doing it illegally, the timing is right when the authorities are gone. You’ll need to familiarize yourself with their check-up schedule and act accordingly. You can either announce to the people around you that it’s skinny dipping time, or simply walk to the water and start undressing.  In either case, encourage the person you talked to in Step 2 to join in.  Everyone else will start to get jazzed about the idea when they see another person join. If you're feeling particularly bold, pull an attention-grabbing stunt.  If everybody's practicing their cannonballs and you're up on the diving board, take your suit off at that moment.  You'll make a bigger "skinny-dipping entrance." You won't feel comfortable getting naked if you're extremely critical or self-conscious about the way that you look.  Take your clothes off without hesitation, and without grimacing at your perceived flaws.  Think positive things about yourself, and focus on the body parts you like.  No one is perfect, so learn to appreciate the body that you have. Encourage the people around you to be confident, as well. If any friends are hesitant about joining you, try to help them see that flaws are no big deal and that they look fine. Self-consciousness is one of the biggest mental barriers to skinny dipping. When you’re down to your skivvies, take a moment to put your clothes in the right place. If you’re in public, you want them somewhere accessible to you but not accessible to others. In other words, somewhere nearby but hidden. Sometimes there’s that person in the group who thinks it’d be funny to steal everyone’s clothes. This is the person you’re accounting for. However, there’s also strength in numbers and visibility: you could also leave everyone’s clothes in a big pile right in front of everyone. That way they’re right there and no one will be tempted to try to be sneaky. A more modest approach to skinny dipping is to shed your clothes and jump in with your underwear on. Consider yourself so excited to skinny dip that you couldn’t even wait to shed them all. Then, once half-concealed by that sparkly shield of H20, the underwear comes off. It’s likely others will find this comforting, since plenty of people are nervous about being naked (and jumping around) in front of their peers. If you do it this way, you might find that your friends are less hesitant to join in your fun. Swim, splash around and dive.  Be careful about brushing up against other dippers, unless you're sure they're receptive to the contact.  Try to keep the mood light and make the event fun, not weird. While you're playing, keep an eye out on your surroundings, especially if you're somewhere you shouldn't be. If someone else is uncomfortable skinny dipping, tell them you need a lookout anyway – this way they can feel less embarrassed about being embarrassed.
Question: What is a summary of what this article is about?
Time it right. Introduce the idea. Lead the undressing, and undress with confidence. Hide your clothes. Consider taking your underwear off once you’re in the water. Play in the water.

Article: If your S4 has frozen while you are using it and none of the buttons are responding, you can try to force it to shut down.
Question: What is a summary of what this article is about?
Press and hold the Power button for at least ten seconds until the screen turns off. Power your phone back on as your normally would.