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Watch these recommended TED-Ed lessons: How playing sports benefits your body... and your brainThe victory of the underdog. The last minute penalty shot that wins the tournament. The training montage. Many people love to glorify victory on the field, cheer for teams, and play sports. But should we be obsessed with sports? Are sports as good for us as we make them out to be, or are they just a fun and entertaining pastime? Leah Lagos and Jaspal Ricky Singh show what science has to say on the matter. What makes muscles grow?We have over 600 muscles in our bodies that help bind us together, hold us up, and help us move. Your muscles also need your constant attention, because the way you treat them on a daily basis determines whether they will wither or grow. Jeffrey Siegel illustrates how a good mix of sleep, nutrition and exercise keep your muscles as big and strong as possible. Why sitting is bad for youSitting down for brief periods can help us recover from stress or recuperate from exercise. But nowadays, our lifestyles make us sit much more than we move around. Are our bodies built for such a sedentary existence? Murat Dalkilinç investigates the hidden risks of sitting down. The surprising reason our muscles get tired You're lifting weights. The first time feels easy, but each lift takes more and more effort until you can't continue. Inside your arms, the muscles responsible for the lifting have become unable to contract. What's going on? Christian Moro explains how exactly our muscles operate, and what causes them to become fatigued.

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What happens to your body when you start exercising regularly

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Whether you're trying to get fit, build muscle, or you're just tired of the couch, leading a more active lifestyle takes time, effort and determination. Tech Insider explores what will happen to your body when you exercise regularly- and why it's ultimately worth the effort.

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Check out Reshma Saujani's book, Brave, Not Perfect, where she shares powerful insights and practices to help us let go of our need for perfection and make bravery a lifelong habit. By being brave, not perfect, we can all become the authors of our best and most joyful life.

Take the Perfection Quiz, to find out if your need for perfection is getting in the way with your freedom and joy.

Listen to the Brave, Not Perfect podcast, an award-winning podcast that aims to help people discover the secret to making radical change happen in their lives. You'll hear stories of failure and resilience from leading change-makers like Congresswoman Alexandria Ocasio-Cortez, Lizzo, Arianna Huffington, and more, plus learn how you can be brave in your everyday life.

Learn to code with Girls Who Code virtual activities

Check out TED-Ed's learn to code series Think Like A Coder, a 10-episode narrative that follows a girl, Ethic, and her robot companion, Hedge, as they attempt to save the world. The two embark on a quest to collect three artifacts and must solve their way through a series of programming puzzles.

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Teach girls bravery, not perfection - Reshma Saujani

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Women are underrepresented in areas critical to innovation, including STEM fields, politics, and C-suites. What all these have in common is that success requires risk taking and bravery. How do we socialize our girls and boys differently - and why is it important to encourage girls to embrace imperfection?

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How racism makes us sick | David R. Williams

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What yoga does to your body and brain - Krishna Sudhir

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Want to explore more word origins? Do you know why do we call women "ladies"? Or why a coffin is called a "sarcophagus"? Check out this series to find out the origins of odd and interesting words.

Watch these recommended TED-Ed Lessons:

How languages evolve
Over the course of human history, thousands of languages have developed from what was once a much smaller number. How did we end up with so many? And how do we keep track of them all? Alex Gendler explains how linguists group languages into language families, demonstrating how these linguistic trees give us crucial insights into the past.

Where do new words come from?
There are over 170,000 words currently in use in the English language. Yet every year, about a thousand new words are added to the Oxford English Dictionary. Where do they come from, and how do they make it into our everyday lives? Marcel Danesi explains how new words enter a language.

How computers translate human language
Is a universal translator possible in real life? We already have many programs that claim to be able to take a word, sentence, or entire book in one language and translate it into almost any other. The reality, however, is a bit more complicated. Ioannis Papachimonas shows how these machine translators work, and explains why they often get a bit mixed up.

Are Elvish, Klingon, Dothraki and Na'vi real languages?
What do Game of Thrones' Dothraki, Avatar's Na'vi, Star Trek's Klingon and LOTR 's Elvish have in common? They are all fantasy constructed languages, or conlangs. Conlangs have all the delicious complexities of real languages: a high volume of words, grammar rules, and room for messiness and evolution. John McWhorter explains why these invented languages captivate fans long past the rolling credits.

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"OK" is thought to be the most widely recognized word on the planet. We use it to communicate with each other, as well as our technology. But, it actually started out as a language fad in the 1830's. VOX explains the origin of the expression and how it became mainstream.