Feature Prioritization Framework for Fitness App MVP

StartFit is a fictional early-stage startup developing a mobile fitness app targeting busy professionals aged 28-45 who struggle to maintain consistent workout routines. The founding team has brainstormed 18 potential features but needs to narrow to 6-8 features for their minimum viable product (MVP) launching in four months. The candidate features span workout tracking, social motivation, personalized plans, progress analytics, integration with wearables, nutrition logging, guided video content, achievement badges, and community challenges. The team has constraints: two mobile developers, limited backend infrastructure, no video production budget yet, and a goal to reach 1,000 active users within three months of launch. Your task is to develop a clear prioritization framework that evaluates features against relevant criteria (such as development effort, user value, competitive differentiation, retention impact, and technical dependency), then recommend a specific MVP feature set with rationale. The output should help the founding team make a confident build decision and defend it to advisors.