 And they did high-intensity cardio once a week, and then they worked out normal, kind of like four hours a week normally. And what they did for this high-intensity cardio was four minutes of heavy exercise, so that being your heartbeat at 80% to 90% of its max heart rate. And they would do that for four minutes, then take a four-minute, like, walk. Maybe let's use running and walking for an example. You run for four minutes, then you walk for four minutes. You run for four minutes, you walk for four minutes.