Hot air ballooning is a serene experience, but it is not suitable for everyone due to the physical requirements and the nature of the flight. First, pregnant women are strictly prohibited from flying because landings can occasionally be "bumpy," which poses a risk of abdominal impact. Second, individuals with heart conditions, severe asthma, or respiratory issues should consult a doctor, as the changes in atmospheric pressure and altitude can be taxing on the cardiovascular system. Third, the activity is not recommended for those with back, neck, or leg issues, as you must be able to stand for at least 60–90 minutes and may need to absorb the shock of a landing with your knees. Fourth, anyone who has recently had surgery or is wearing a cast should avoid flying until fully recovered. Finally, people with an extreme fear of heights or enclosed spaces may find the open-air basket (which is usually chest-high) to be psychologically distressing. Most operators also have a minimum height requirement (usually 4 feet) to ensure passengers can see over the edge of the basket and a weight limit for safety and fuel calculations.