You have to be in a calorie deficit to lose weight.
If you do cardio you can basically eat more and get away with it because you can create a calorie deficit through cardio.
OR Cardio can help you accelerate your weight loss.
For example, if you need 1,400 calories to lose weight and you eat 2,000 instead.
You could run for an hour which may burn 600 calories.
2,000 - 600 = 1,400
By doing cardio you just created a calorie deficit enough to lose weight.
Cardio = burned calories
Weight loss is a function of a calorie deficit.
A calorie deficit by itself is not the "optimum" way to lose weight, but it sure is the most simple and easy to understand way.
That’s it!
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