在當今社群媒體時代，使用線上影音來學習知識已經融入人們的日常生活，影音平台能提供多元且豐富的學習內容供大眾使用，舉凡各領域大至天文地理小至閒話家常的題材皆可在此取得。其中YouTube是台灣最常使用的影音平台，有眾多類型的YouTube頻道彼此競爭、合作，因此使用者的喜好與習慣成為經營YouTube的熱門話題，瞭解使用者的觀看動機及參與行為之關聯應有助於提升被選中觀看的機會。過去的YouTube頻道類型之研究對於健身內容的類型討論相對較少，故本研究將以健身YouTube頻道作為討論方向。透過半結構式訪談九位使用者，分析使用者觀看健身YouTube頻道如何影響健身動機和健身參與活動間之關聯性，並歸納出健身參與者對健身YouTube頻道內容呈現要素與YouTuber形象之期待。研究結果得出，不同健身動機參與者在觀看健身YouTube頻道會有不同的偏好，且對於不同階段的健身活動參與者在觀看健身YouTube頻道會有不同的資訊需求，因此引導出不同的健身活動程度。此外，研究結果得出使用者的健身參與歷程可以分為三個階段分別為：決定採用期、摸索操作期、熟悉健身期，每個階段對頻道有不同的內容需求也形塑出不一樣的健身參與行為的表現。

Using online video as learning tool has been popular way to get new knowledge in the social media. YouTube is the most commonly used video platform in Taiwan, many types of YouTube channels compete and cooperate with each other. Therefore, understanding the users’ viewing motivations and participation behaviors should help to be popular. In this study we aim the fitness YouTube to discussion. Using semi-structural interview as research instrument to collect 9 fitness participant data, to understand the relationship between users’ watching motivation of fitness channels and their fitness participation behaviors. Besides, we concluded the presentation factors with fitness participants and the expected image of YouTuber’s attractive. In summary, the result of the analysis presented: Participants with different fitness motivations will have different preferences when watching fitness YouTube channels, and watching fitness YouTube channels will have different levels of impact on participants of different fitness activities. This result proves the close relationship between fitness YouTube channels and fitness participation behaviors. Also this research found YouTube users’ viewing motivation and fitness participation process can be divided into three stages: “Decide on the adoption”, “Exploratory action” and “Familiar with fitness”, and each stage has a different fitness activity performance.