This document summarizes a student project to design and build an elliptical trainer bike. Four students - Pradeep, Sukhdev, Vimal, and Ashish - constructed a prototype cross bike that provides a full body workout with low joint impact while burning calories similarly to a treadmill. The project involved using various shops and machines across campus, including welding, fitting, sheet metal, machine, carpentry, and blacksmith shops. The students launched their working prototype bike and learned valuable lessons about teamwork, tool usage, dimensioning, and applying theoretical physics to practical models.