Final answer:
Juan is performing bodyweight exercises such as planks, pullups, and pushups. These exercises use the body's own weight as resistance to build strength and endurance.
Step-by-step explanation:
Juan is performing bodyweight exercises. These types of exercises involve using your own body weight as resistance, without the need for additional equipment. Planks, pullups, and pushups are all examples of bodyweight exercises that help build strength and endurance.
Learn more about Bodyweight exercises