There is nothing you have to buy. It depends on your personal preference. Small fitness equipment, it is recommended to buy fitness balls, dumbbells and elastic belt. Large-scale equipment can buy treadmills and elliptical machines to enrich exercise methods. Large-scale equipment should pay attention to the choice of big brands, such as treadmills, depending on the hardware such as motors, shock absorption performance and running belts. I recommend you to buy the Elkonotik series of the United States, and its overall performance is among the top in the industry.