This document proposes a new fitness tracking service called BodyAdvises that aims to replace existing fitness trackers by providing users with answers to questions about their health and fitness based on limited data collection. It would measure a user's pulse when lying down and standing up each day and use this biobehavioral coupling analysis to assess metrics like fitness and well-being, rather than just collecting extensive activity data. The document outlines the company's business model of subscriptions, a social network, and wearables, and provides projections of 10 million monthly users generating $5 million in revenue within 3 years.