The use of horizontal exercise (e.g., rowing, swimming, recumbent bike, etc.) at the beginning is a critical strategy, allowing patients to exercise while avoiding the upright posture that elicits their POTS symptoms. As patients become increasingly fit, the duration and intensity of exercise should be progressively increased, and upright exercise can be gradually added as tolerated. You should start with low-intensity exercises that allows for comfortable conversation (50-60% of your maximum heart rate, which can be calculated by subtracting your age from 220). It is essential to monitor your heart rate and symptoms throughout the session so that you can make any necessary adjustments to your exercise routine. If symptoms worsen significantly, it is okay to stop. Document your progression in Table 2.