Dear user, sorry to hear you are seeking a refund.
May you give our Premium features another chance? They are designed to help you reach your goal, whether it's weight loss or increased endurance, faster. Also you can cancel your subscription anytime you want.
However, if you decide to proceed with getting a refund, please note that we are not authorized to arrange it. Please contact Apple Support directly. You are eligible for a refund within 90 days since the moment of purchase.