All student divers complete a brief scuba medical questionnaire that asks about medical conditions that could be a problem while diving. If none of these apply, sign the form and you’re ready to start. If any of these apply to you, your doctor must, as a safety precaution, assess the condition as it relates to diving and sign a medical form that confirms you’re fit to dive. In some areas, local laws require all scuba students to consult with a physician before entering the course. Before completing the PADI Open Water Diver course, your instructor will have you demonstrate basic water skills to be sure you’re comfortable in the water, including: Swim 200 metres/yards (or 300 metres/yards in mask, fins and snorkel) without stopping. There is no time limit for this, and you may use any swimming strokes you want. Float and tread water for 10 minutes, again using any methods you want. Any individual who can meet the performance requirements of the course qualifies for certification. There are many adaptive techniques that allow individuals with physical challenges to meet these requirements. People with paraplegia, amputations and other challenges commonly earn the PADI Open Water Diver certification. Even individuals with more significant physical challenges participate in diving. Talk to your PADI Instructor at your local PADI Dive Center or Resort for more information. (This response was copied from www.padi.com FAQ page)