Your Muscles Are Seriously Going to Shake If you look at other people in a barre class, you might not see them moving very much. That's because the goal is to hold positions for as long as possible in isometric holds so that you muscles start shaking and burning. And that's exactly what you want. "You body is supposed to feel like it's working," says Norton. Schwefel explains that the shake/burn you'll feel during a barre class is a sign of fatigue, as you're challenging your muscles to stay in positions for long periods of time. "These are often muscles that don't get a lot of work," says Schwefel. Pushing through the shake is what will change your muscles and get you results (which included strengthened and toned muscles along with better posture).
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