"Running in Place" is a video demonstrating a cardio exercise where the individual mimics the motion of running while staying in one spot. This exercise involves lifting the knees alternately towards the chest and moving the arms in a running motion to elevate the heart rate and engage the lower body muscles, including the quadriceps, hamstrings, calves, and glutes. The video typically focuses on maintaining a steady pace, proper form, variations, and the benefits of incorporating running in place into a warm-up, cardio workout, or interval training routine to improve cardiovascular endurance and burn calories effectively.