swimming游泳英文教程.ppt

 Introduction to swimming What are the swimming strokes? 1.Breaststroke （蛙泳）（蛙泳） 2.Butterfly （蝶泳）（蝶泳） 3.Backstroke （仰泳）（仰泳） 4.Crawl (freestyle) （自由泳）（自由泳） What are the benefits of swimming? 1.Low impact 2.Builds cardiorespiratory（心肺的）（心肺的）fitness and muscle mass 3.It's a break from the summer heat 4.Burns calories SummaryIntroduction to swimmingbackWhat are the swimming strokes?Breaststroke （蛙泳）（蛙泳）Butterfly （蝶泳）（蝶泳）Backstroke （仰泳）（仰泳）Crawl (freestyle) （自由泳）（自由泳）backWhat are the benefits of swimming? 1. Low impact 2.Builds cardiorespiratory（心肺的（心肺的) )fitness and muscle mass 3.It's a break from the summer heat 4.Burns caloriesbackSummary Swimming is an activity that builds strength, endurance, and muscle tone. It's an activity that you can do all year long, inside or outside, it burns lots of calories, you can share it with your family, it's low-impact, and you can do it until you're 100! It's not too late to start if you never learned how (learning new stuff is cool even when you're adult!), and for those of you who can swim and would like to compete, that's available as well.All in all, swimming is a winner, and if you have the inclination（爱好）（爱好）, I suggest that you go for it!Thank you!BreaststrokeThe leg kick:–Bring the knees to chest.–Thrust the legs backward and straight.–Snap the legs together to push the water and propel you forward (frog kick).The arm stroke:–Start with the arms overhead.–Pull on the water, and bring arms toward the chest.–Keep the hands cupped.–Return arms to starting position.The breathing:–Breathe every time you stroke with your arms.BreaststrokebackButterfly The leg kick:–Bend the knees slightly, and keep them together.–Make a downward thrust by straightening the knees and whipping the feet downward.–There should be two kicks for every arm stroke.The arm stroke:–Move the arms together, and pull through the water with the hands cupped.–Face the palms outward, and press down and outward.–Swing the arms forward above the water in a sweeping motion to complete the stroke.The breathing:–Breathe at the end of the arm stroke.ButterflybackBackstrokeThe leg kick:–It's a flutter kick where the legs kick in an alternating order.–Bend the knees slightly.–Relax the feet and ankles (they should be almost floppy).–Emphasize the up-kick for propulsion.The arm stroke:–Move the arms in an alternating, windmill pattern as they rotate and pass your face.–Cup the hands, and the thumb leaves the water first.–Move the hands in an "S" pattern when they are pushing the water.The breathing:–Keep your head back and eyes toward the ceiling.–You can find your own breathing pattern with the backstroke because the breathing is less coordinated with the arms and kick than other strokes since your head should always be out of the water.BackstrokebackCrawl (freestyle)The leg kick:–It's a flutter kick where the legs kick in an alternating order.–Bend the knees slightly.–Relax the feet and ankles (the should be almost floppy).–Emphasize the down-kick for propulsion.The arm stroke:–Move the arms in an alternating windmill motion.–Pull each arm through the water with equal strength and arm reach to ensure that you swim straight.–Pull arms underwater in an "S" pattern.–Cup the hands but keep the wrist and hand relaxed during recovery.The breathing:–Raise one arm to begin the stroke. As the shoulder rises, turn the head to catch a breath.–Turn the head only enough to leave the water to breathe. Do not lift the head because it will slow you down.–Take as many breaths as necessary and then exhale through the nose and mouth when the head returns to the water.–Repeat the head turn to the other side in coordination with the beginning of the opposite arm stroke.Crawl (freestyle)backLow impact There’s no ground impact when you swim, and so you protect the joints from stress and strain. In fact, the Arthritis（关节炎）（关节炎）Foundation strongly recommends swimming and water activities for this reason, so much so that they sponsor（发起）（发起）water classes all over the country.backBuilds cardiorespiratory fitness Swimming improves endurance. A study sedentary(需要久坐的需要久坐的) middle-aged men and women 12 weeks result: maximal oxygen consumption improved 10% stroke volume improved as much as 18%Builds muscle mass In a study of men who completed an eight-week swimming program, there was a 23.8% increase in the triceps muscle (the back of the arm). backIt's a break from the summer heat It's relaxing, the movements are smooth and rhythmic, and it's a great workout.backBurns calories Swimming burns lots of calories, anywhere from 500-650 per hour depending on how efficiently you swim (you burn more flopping around than swimming cleanly!) and how buoyant（有浮力的）（有浮力的） you are (the more body fat you have, the more you float and the fewer calories it takes to swim). Very early and original research on swimming and calorie expenditure showed that swimming, regardless of the stroke, burned about 89% of the calories burned during running and 97% of the calories burned during cycling for the same time period. back。