![]() ![]() In positions like these, the muscle fibers are activated but since there are equal forces against each other, there is no movement. And if you've ever taken a barre class, you know how hard it can be to simply hold still while your muscles are contracted. ![]() Holding a plank is another example you're likely familiar with. There-you just did an isometric exercise. You'll feel tension in your chest and arms, yet your arms didn't move at all. ![]() Say what? Imagine pressing your hands together in a prayer position as hard as you can for 10 seconds. In these exercises, your muscles tense up, but don't actually move. But believe it or not, you can build serious strength-without even moving a muscle. Some fitness trends make it seem like in order to get in shape, you have to bounce around like crazy, throw tires into the air, or leave a pool of sweat on the ground after every workout.
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