Ready for some Friday R&R? Catch up on the latest and Greatist in fitness, health, and happiness with our weekly roundup of our most popular articles this week:

Tai Chi — This Week’s Grobby

With an emphasis on breathing that provides physical and psychological benefits, this week’s Grobby (that’s Greatist lingo for hobby) is an ancient Chinese form of exercise perfect for practitioners of any age.

Does Muscle Weigh More Than Fat?

Busting the muscle/fat myth! Muscle does not technically “weigh” more than fat. But, because one pound of fat takes up about four times the space of muscle, it’s actually possible to look and feel slimmer, even if bodyweight remains the same.

Superfood: Eggs

This ain’t no ordinary breakfast food! Inexpensive, low in calories, and packed with nutrients essential for brain development, find out why eggs are this week’s Greatist superfood.

Is My Water Bottle Leaking Toxic Stuff?

BPA (bisphenol A), a substance commonly used to make water bottles and food containers, has gained loads of negative press recently for it’s possible health risks. Find out what to watch out for and how to avoid BPA.

27 Scientifically-Backed Ways to Get Better Sleep

The average person spends more than one third of their life sleeping. But, for many, tossing and turning all night can have not-so-great side effects on judgment, productivity, and memory, and (over time) can lead to more serious issues like obesity and diabetes. Here’s our Greatist list of 27 ways to get better sleep— all based on scientific evidence.