Some people experience muscle shakes or quivers when working out. This phenomenon is especially common when performing abdominal exercises but can happen during any form of exercise. The reason behind the muscle shake, simply put, is they are working… hard… and they’re being depleted of their energy sources. It means that you are working your muscles at an intensity that cannot be sustained for very long. When muscles get fatigued, they tend to quiver. If you are doing a new exercise, or have increased the intensity of a familiar exercise then you can probably expect this to happen. As your body adapts to the exercise and as you become more aerobically fit, you will shake less. Aerobic fitness is the capacity of the heart & lungs to deliver oxygen for sustained energy production and the ability of your muscles to effectively use the oxygen delivered. The more aerobically fit you are, the more capable your body is to produce force and sustain prolonged activity. As for the shakes, don’t let them worry you. If you continue with a balanced program of cardio, strength, flexibility, and proper nutrition, you’ll experience the shakes less and less. Congratulate yourself on working hard enough to experience them.
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