中文版：我常常感到缺乏动力和毅力坚持健身，你有什么好的建议和技巧吗？例如，如何培养健身的习惯，如何保持动力和激情等等。请从心理和行为习惯两个方面给出建议。

英文版：I often feel a lack of motivation and perseverance to stick to fitness. Do you have any good suggestions and tips? For example, how to develop a fitness habit, how to maintain motivation and passion, etc. Please provide suggestions from both psychological and behavioral habit aspects.

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