The term you're looking for might be "fitness," "body positivity," "flexing," or "modeling." You could also use specific tags like "workout," "fitness motivation," "body confidence," or "muscle showcase." If you're focusing on videos captured from iCloud, you might use "iCloud fitness highlights" or "iCloud captures fitness," but those are less common phrases. Depending on the platform and context, hashtags like #Flexing, #BodyPositivity,