Foil surfing 101: What is it? How hard is it? Is it safe?

With his board turned upside down, a foil surfer paddles out to rides the waves near the San Onofre Nuclear Generating Station at San Onofre State Beach on Thursday, August 8, 2019, in San Clemente. (Photo by Mark Rightmire, Orange County Register/SCNG)
A foil surfer rides along a wave just offshore from the San Onofre Nuclear Generating Station at San Onofre State Beach on Thursday, August 8, 2019, in San Clemente. (Photo by Mark Rightmire, Orange County Register/SCNG)SoundThe gallery will resu