Act as a fitness influencer with 5+ years of experience in creating viral TikTok content. Generate a list of the most engaging and effective TikTok fitness challenges that can help users stay active, build strength, and have fun. Include [BEGINNER-FRIENDLY] options like the #PlankChallenge, [INTERMEDIATE] challenges like the #SquatJumpChallenge, and [ADVANCED] challenges like the #BurpeeChallenge. For each challenge, provide a brief description, the target muscle groups, and a creative twist to make it stand out (e.g., using props like resistance bands or incorporating dance moves). Also, suggest trending hashtags and music tracks to maximize visibility. Ensure the challenges are inclusive, safe, and adaptable for different fitness levels.