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hard work
never giving up
healthy lifestyle

but some weight loss programs wont help all the way, they can teach you to always try to reach your goal.
Ahlaam7

Answer: the principle of overload,  progression, and the principle of specificity.

Explanation: The best fitness training programs are built on three principles: overload, progression, and specificity. By using these principles, you can design an exercise program that improves performance, skill, ability, and physical fitness.