Our expert says:
It is possible that the difference in weight that you see when you train, is due to development of muscle tissue which ironically weighs more than fat tissue!In some cases strenuous training can cause a stress reaction that produces cortisol (an adrenal hormone), which could cause water retention. When you relax and your cortisol levels drop, the water is excreted and you, therefore, lose 'mass' although you may not have lost a gram of fat.
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