現今社會，國內青少年面臨眾多的文明病當中，肥胖，是大多數青少年所面臨最棘手的問題。然而，肥胖所牽涉的問題不只是飲食的精緻化、需求的提升；缺乏計畫性的運動更是現在肥胖文明病最直接的課題。另外，青少年的運動行為在健康體適能中扮演著十分重要的角色。運動行為包含了運動的強度、運動的頻率以及運動所持續的時間，所以運動行為的程度與健康體適能是息息相關的。
本研究設計了運動行為的問卷，提供國中生運動行為差異的程度與其健康體適能所表現的成績，運用統計的方法記錄得知運動行為以及健康體適能相關性的影響。其研究目的為：
一、探討不同年級女國中生對於運動行為與體適能表現之影響。
二、探討不同年級男國中生對於運動行為與體適能表現之影響。
三、探討不同性別男女國中生對於運動行為與體適能表現之影響。
四、探討不同性別國中生之運動行為對於體適能表現的相關性影響。
結果發現，體適能表現對於不同年級以及不同性別皆有差異。運動行為問卷量表中，我們可以清楚知道不同的年級與性別皆有分佈的不同。當中，運動行為以及體適能的結果中，交互影響的因子更可以解釋運動行為與體適能之間的相關重要性。

　　In this society nowadays, teenagers in our nation have faced various Diseases of affluence. Within this, obesity is the most dreadful problem among teenagers. However, the problem causes the obesity are not only the exquisite food, but lack of the planned exercise which is the key factor of the obesity. On the other hand, teenagers’ sports behavior also plays the crucial role in the field of physical fitness. The sports behavior includes strength, frequency, and the duration of sports. So, there is a strong connection between the sports behavior and the physical fitness. Our study designed the questionnaire as to the sports behavior, providing the difference between sports behavior and physical fitness. We also used the statistic methods to realize the correlation between sports behavior and physical fitness. And the aid of this study is:
1.To reveal the influence of sports behavior on the physical fitness in different grade of female students
2.To reveal the influence of sports behavior on the physical fitness in different grade of male students
3.To reveal the different genders’ difference between sports behavior and physical fitness.
4.To reveal the correlation between sports behavior and physical fitness.
The results showed that the performance of sports fitness has the difference among different grades and genders. Within the questionnaire as to the sports behavior, we can figure out that there are different distribution between different grades and genders. In light of this, the interactive factors can further explain the strong connection between the sports behavior and the sports fitness.