Activities Sports & Athletics Aerobic Exercise: Definition Share PINTEREST Email Print Tara Moore/Taxi/Getty Images Sports & Athletics Bodybuilding Training & Routines Basics Health & Safety Baseball Basketball Bicycling Billiards Bowling Boxing Car Racing Cheerleading Cricket Extreme Sports Football Golf Gymnastics Ice Hockey Martial Arts Professional Wrestling Skateboarding Skating Paintball Soccer Swimming & Diving Table Tennis Tennis Track & Field Volleyball Other Activities Learn More By Hugo Rivera Hugo Rivera is a nationally ranked competitive bodybuilder. He has written several books on fitness and bodybuilding, including "The Body Sculpting Bible." our editorial process Hugo Rivera Updated March 08, 2017 Definition: Constant moderate intensity work that uses up oxygen at a rate in which the cardio respiratory system can replenish oxygen in the working muscles. Examples of such activity are exercises like stationary bike riding or walking. It is a good activity for fat loss when done in the right amounts but highly catabolic if done in excess. Also Known As: Cardiovascular Exercise, aerobics or simply cardio.