Or does 虽然 always need a 但是/可是？And is the structure of the sentence alright, or does it sound too novice?
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因为锻炼也是我的兴趣，我可以用你的录像学汉语。虽然我还在汉语水平考试级3. This sentence is fine, though the phrase started with 虽然 is preferred to be the leading phrase in the sentence, so be sounding more sophisticated:
虽然我还在汉语水平考试级3, 因为锻炼也是我的兴趣，我可以用你的录像学汉语。 (though + because of + so), or
虽然我还在汉语水平考试级別3, 我之所以用你的录像学自汉语, 因为我挑戰是我的性向，(though + but/why + because), or
虽然我还在汉语水平考试级別3, 我可以嚐试經由你的录像学汉语作為一個(種)锻炼， (though + but).