Is it even possible (excluding the fact if someone does nothing but work out or work out for hours every day)?
In: Biology
Yes, but maybe a complete body transformation is an exaggeration.
If you exercise often and eat much less/healthier (this is the biggest part of it), you can lose a lot of weight.
The only way to lose weight is to have a calorie deficit. That is, your body uses more energy than you consume. This can be achieved by exercising or eating less (or less calorie dense foods)
Gaining muscle is accomplished by exercising and particularly, exercises that use that particular part of your body
The trick is to pick a sustainable diet and workout routine. No point in going 100% for 6 weeks and then reverting back to your old ways
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