Standing still can be particularly difficult for some people with POTS. Small leg movements or other physical strategies may be included in an individualized plan, but they are not a guarantee against blood pooling, dizziness, or fainting.
Get advice that fits the situation
Ask your clinician which strategies are appropriate for you and when to use them. Joint problems, pain, balance, and other conditions can affect the choice. A movement that is safe while seated may not be safe while you are already unsteady in a queue.
If you feel faint, prioritize getting to a safe seated or lying position and following your care plan. Do not keep standing and exercising your legs in an effort to prove you can manage. Ask for help and avoid situations where a fall would be especially dangerous.
Change the environment as well
Request seating, reduce unnecessary standing, or use an appropriate mobility aid if recommended. Arrange tasks so you can sit before symptoms build rather than treating every episode as a test of your coping skills.
The Johns Hopkins POTS overview describes a range of individualized treatment approaches. Movement is only one possible piece of that care. You deserve accommodations and medical support, not just instructions to make more adjustments with your own body while the demands around you stay the same.