Really want to change your body and your fitness level? Join the best fitness movement in the nation! Try the hottest one-hour group personal training workout and keep burning calories for up to 36 hours. Orangetheory Fitness offers 60-minute workout sessions split into intervals of cardiovascular and strength training with heart rate monitors to track intensity and maximize metabolic burn. Increase energy, get visible results and burn more calories, even after leaving the studio. Thats the Orange Effect! Backed by the science of post-exercise oxygen consumption (EPOC), our heart-rate monitored training is designed to keep heart rates in a target zone that stimulates metabolism and increases energy. Our clients burn an estimated 500 to 1000 calories per workout. We are 5 zone heart-rate interval training.