The old saying, “Insanity is doing the same thing over and over and expecting a different result” also pertains to your workouts. Over time, your muscles adapt to the same old routine. That means you can get better gains from changing things up.

Jumping straight into a HIIT workout or CrossFit class without knowing what you’re getting yourself into can create a recipe for overtraining or injury .

We looked back at the weirdest, wildest and most popular fitness, diet and exercise fads of yesteryear and asked, “Where are they now?”

Certifications can cost upwards of $1,000 if you opt for all the bells and whistles. However, if you're tight on cash you can snag a certification for much less than that.

You'lll need some serious stamina, because this workout burns approximately 1,330 calories (depending on your weight).

This workout combines biceps and triceps movements in a superset style to give you a super effective arm workout.

This high-intensity workout incorporates 10 moves that emphasize all of the muscles in your glutes.

The following celebs aren't just running from the paparazzi; they've made running part of their daily health routine. Read on to find out which actors, singers and TV personalities hit the pavement to stay in shape.

We all have our reasons for going to the gym. And muscle hypertrophy, or growth, is one of the main ones. To build lean, dense muscle, you must progressively overload your muscles to enhance muscle fiber recruitment. How do you do that?

From Kate Upton to Emma Stone, here are 12 Hollywood hotties who can lift weights with the best of them.

This strength workout is designed to improve the strength and function of the major muscles of your back.

This comprehensive core workout addresses all four major muscle groups of your torso. Perform each move for 45 seconds, then rest for 15 seconds.