Commercial cardio equipment in gyms is designed to improve cardiovascular fitness and endurance through a variety of exercises. Common machines include treadmills for walking and running, ellipticals for low-impact workouts that mimic running, and stationary bikes for cycling workouts. Rowing machines provide a full-body workout that improves cardiovascular health while also engaging multiple muscle groups. Stair climbers simulate the motion of climbing stairs to build leg strength and stamina. These machines typically offer adjustable resistance levels and built-in programs to cater to different fitness levels, making them popular for both beginners and advanced users seeking to enhance their cardiovascular health.