Hot air ballooning is a serene activity, but it carries physical demands and risks that make it unsuitable for certain individuals. Most operators strictly prohibit pregnant women from flying due to the possibility of a "bumpy" landing, which could cause physical trauma. People who have recently undergone major surgery or have chronic back, neck, or joint problems should also avoid it, as the landing process often requires passengers to bend their knees and absorb a significant jolt if the basket tips or drags. Additionally, those with a severe, paralyzing fear of heights (acrophobia) may find the experience overwhelming, although many people with a mild fear find the lack of a "sensation of movement" to be quite calming. Children under a certain height (usually around 4 feet or 1.2 meters) are often restricted because they cannot see over the edge of the basket and may be tempted to climb. Finally, individuals with certain respiratory or heart conditions should consult a doctor, as the burner's noise and the slight change in altitude could potentially trigger issues. Always be honest with the pilot about any medical conditions before boarding to ensure a safe flight.