Rohan embarked on an entrepreneurial venture by establishing a gym called Fit Zone. He equipped the facility with a diverse range of machines and enlisted qualified trainers to assist customers in their workouts. Initially, he set a nominal hourly fee to make the gym accessible to individuals from economically disadvantaged backgrounds. The gym quickly gained popularity, prompting Rohan to operate in multiple shifts and hire additional trainers. He also expanded the facility by installing extra machines to accommodate a larger customer base. Identify the type of business expansion undertaken by Rohan.