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If you're an influencer, no matter how “big”, you have a unique relationship with your followers. Brands are aware that they cannot replicate it and thus are willing to pay for access to that relationship so you advertise their brand for them.

Balanced nutrition is an essential part of any well-rounded fitness plan. That's why fitness apps have begun to extend their product offering by implementing various nutrition-related features, such as calorie calculators or customized nutrition plans.