In one sentence, describe what the following article is about: Your posture while cycling is also crucial if you want to avoid back pain. Try to keep your back straight while cycling not completely erect like sitting in a chair but rather flat, stable and well supported by squared shoulders. Distribute some of your weight to your arms and hands while keeping your chest and head up. Shift positions and change the angle of your upper body periodically in order to prevent muscle fatigue. Gently lifting and lowering your head from time to time is helpful for keeping your neck loose and avoiding muscle strains. Approximately 45% of overuse injuries to professional road cyclists involve the low back. When riding your bike, keep your arms slightly bent (10 degrees) while gripping the handlebars. This posture will allow the joints and muscles of your upper body to absorb some of the vibrations and impact instead of your spine, particularly if you tend to ride on rough terrain such as forest or mountain paths. Grip the handlebar with your whole hand, but not too tightly. Wear padded cycling gloves to help with shock absorption. If your back tends to act up while cycling, break your ride into segments and take more rest stops. When peddling, it's more efficient and best for your hips and low back to have your knee bend at a 90 degree angle at the top of the peddle stroke (when it's farthest from the ground). At 90 degrees, your thigh should be roughly parallel to the saddle, which then allows for a strong push down on the pedal. At the bottom of the stroke (when the peddle is closest to the ground), your knee should be flexed at about 15-20 degrees, which is unlikely to strain the low back muscles, tendons and/or ligaments. If your legs do not match these angles while you pedal, then adjust the height of your saddle. The front 1/3 of your foot should be in contact with the pedals while peddling.
Summary: Avoid slouching or hunching your shoulders while riding. Keep your arms slightly bent while riding. Keep your leg at a 90 degree angle at the top of the stroke.

Many celebrities live in these cities, and spending time there may increase your chances of meeting someone famous. Either make clear your hobby of taking photos with the stars, or casually mention your particular interest to one person. You never know who knows the guy who knows the guy who knows the guy who trains Brad Pitt. Play it cool. Just as you would protect your friends, colleagues, boss, or employee from someone who seems threatening, someone involved in the life of a celebrity is not going to introduce you if you seem dangerous, bizarre, or embarrassing. Express your interest in a particular field of art or entertainment, rather than one particular person. If your social and work network knows of your love of film, music, or theater, they are more likely to share information, tickets, and news pertaining to a wide variety of people in your interest group. You might get information on a Beyonce concert if your friends know you love pop music. But if they think you only are interested in Taylor Swift, they may not bother to tell you. When you go for coffee or lunch in a popular area, ask the people working there who comes in. Some people can be very open, and may even tell you which day of the week, or time of day, certain people tend to get their groceries or pick up their takeout. Theater performances, gallery openings, book signings, and other official appearances will be noted. Visit the theater or gallery where the celebrity is scheduled to appear. Talk with the people who work there. You never know who may tell you a bit of information regarding his or her whereabouts.
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One-sentence summary -- Visit Los Angeles, New York City, or London. Network. Ask around. Read the Arts section of the newspaper.

Problem: Article: Mix a cup (240 mL) of raw honey with two cups (475 mL) of distilled vinegar, a tablespoon (15 mL) of olive oil, and a tablespoon (15 mL) of cardamon. Mix the ingredients until you have an even consistency throughout. Then, work the mixture evenly into your hair and put on a shower cap. Leave the mixture on and wash it out in the morning. For best results, make sure you're using raw, uncooked honey. You may have to find this at a health store. Brew a strong cup of chamomile tea using a tea bag or tea leaves. Let it cool until it's lukewarm and pour it over your hair. Let your hair dry for about half an hour. Then, shampoo and condition your hair as you normally would. You may notice some lightening. This is a good method to try in the morning. You can make a cup of tea, apply it to your hair, and then wash it out during your normal shower routine. Mix warm water and baking soda together until you have a thick paste. Amounts will vary depending on the length of your hair. Work the paste into your hair. Let it sit on for 15 minutes before rinsing and shampooing your hair. Sprinkle some cinnamon onto a handful of conditioner and then work the mixture into your hair using your fingers or a comb. Pull up your hair and secure it with a towel or a shower cap. Keep the mixture in overnight and rinse it out in the morning. You may notice your hair has lightened. During the summer, when rhubarb is in season, you can use it to lighten your hair. Mix about a quarter cup (60 mL) of chopped rhubarb in with two cups (475 mL) of water. Bring the water to a boil and then strain the liquid. Work the liquid into your hair and let it sit on for 10 minutes before rinsing it out. Mix a cup of lemon juice with two cups of water. Work the mixture into your hair. Let it sit on until it dries. Your hair may lighten in response to lemon juice.
Summary:
Use honey, vinegar, olive oil, and spices. Rinse your hair with chamomile tea. Apply baking soda to your hair. Add cinnamon to your conditioner. Use rhubarb. Lighten your hair with water and lemon.