1. cardiovascular exercise; aerobic exercise that strengthens the heart and lungs
Usage: informal; commonly used in fitness contexts

1. relating to or affecting the heart and blood vessels
Usage: informal; short for cardiovascular

Examples

• I do 30 minutes of cardio every morning on the treadmill.
• Swimming is an excellent form of cardio that's easy on the joints.
• Her cardio fitness improved significantly after training for the marathon.
• The gym has a dedicated cardio section with ellipticals and stationary bikes.
• Doctors recommend at least 150 minutes of cardio per week for adults.
• He combined cardio with strength training for a balanced workout routine.