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American Men: As Fertile as Dead Hamsters

Sperm counts have declined 59%. Here's why you should care, even if you're not ready to make babies.

Tip: Determine Your Testosterone Level Instantly

Find out if you have high or low T just by checking out this body part. And no, it's not the part you're thinking about.

Tip: The Truth About Catch-Up Sleep

Does sleeping in on weekends help you make up for poor weekday sleep? Or does it just make you fatter? Science has taken a look.

10 Daily Habits of Healthy Lifters

Train hard. Eat right. But what else? It's those little things that can add up to major progress. Here's what our experts are doing.

Big Plastic Muscles

Forget about steroids. Now there are biceps and triceps implants, silicone abs, and even plastic lats and delts. How far can it possibly go? Find out here.

The Truth About Waist Trainers

Figure and bikini competitors use them. Celebrities endorse them. But what's really happening to the body when squeems are used? Here's the nasty truth.

Tip: The Coregasm is Real

Women have whispered about it for years and now science has confirmed its existence. This is fascinating.

The Fake Butt Phenomenon

From fitness celebrities to reality stars, augmented asses are everywhere. Here's how they do it and how to spot the pretenders.

Tip: Is Your Phone Wrecking Your Workout?

Is your smartphone making your workout dumb? Or does it make your workout better? Science has some answers.

Tip: The Bad Habit That Makes You Overeat

Not only does this make you eat 385 extra calories a day, it also saps your natural testosterone. Check out the science.

Keep Kicking Ass After 40

Everything you need to know about training, diet, and supplements to help you keep kicking butt after age 40.

Tip: Don't Be a Likes-And-Favorites Whore

It's an easy trap to fall into, and it can wreck you. Here's how.

Strong Hearts and Big Fat Lies

Most of what we know about heart health is a big fat, artery-clogging lie. Here's what's true and untrue about taking care of your ticker.

Tip: To Lose Fat, Stop Being a Pantywaist

This may hurt your feelings, but it'll also solve your fat loss problem. Step away from your safe space and check it out.

Tip: Does Your Sweat Turn Women On?

Is sweat really an aphrodisiac? Here's what science has to say.

How Not to Go Bald

Stopping hair loss is possible. And you might even be able to grow some back. Here's a sciency look at 12 treatments.

Tip: Grit is a Skill. Build Some, Wimp.

Not many people have it these days. Here's why those who do have an advantage in life.

9 Ways to Live Longer and Look Better Naked

These foods, workouts, supplements, and drugs will help you live longer and look great doing it. Check out the list.

Tip: Avoid Xenoestrogens and Phytoestrogens

These manmade and naturally occurring compounds can make you less of a man. Really. Here's where they're hiding.

Tip: Being Fat Is Your Fault

And that's good news. Here's why the first step to fat loss is taking personal responsibility. Warning: Real talk here.

Tip: Here's What Women Want

What hormones, the pill, and scent can teach us about sex, attraction, and having better relationships.

Tip: Avoid the Goal Vampires

There are people in your life that want to suck out your energy and hold you back. Here's how to spot them and what to do about it.

Tip: 2 Ways to Fight Sitting Disease

Forced to sit four or more hours a day? It doesn't matter how much you exercise, it'll still hurt you. Here are 3 practical solutions.

Tip: A Quick Guide to Hardcore Sleeping

Inadequate sleep reduces insulin sensitivity and makes you fat. Here's why and how to get more restorative sleep.

Tip: 3 Ways to Beat Chronic Stress

Your body needs cortisol, but too much will wreck your gains and performance. Here's how to keep it under control.