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If you don't rehydrate yourself during exercise in gym, you would suffer from dehydration that can cause fatigue, syncope, spams, cramps.
You should always maintain proper hydration during the exercise
If you feel very tired, without exercise then following things should be ruled out:
2. Calcium and Vitamin D deficiency.
I would advise you to get following tests done:
1. Fasting Blood Sugar
2. Thyroid Profile
4. Serum Calcium and Vitamin D levels.
I hope it helps.
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