Paragliding is an air sport in which a pilot flies a light and unmotorized foot-launchable aircraft called a paraglider. The pilot is suspended from the wing by a harness and controls the aircraft by shifting body weight in opposition to a control frame.
Yes, paragliding requires a certain level of physical fitness. You should be able to run a few steps to take off and land. You do not need to be an athlete, but you should be in good health with no medical conditions that would prevent you from participating.
The altitude you will fly at depends on the conditions on the day. Typically, pilots fly at altitudes between 100 and 3,000 feet above the ground.