I know my Kenpo works for two reasons:
1 I know my roundhouse kick works, because when the BIG DOG was charging at me snarling and growling and I nailed it with a picture perfect roundhouse kick, with just a little upward deflection, that German Shepherd FLEW about 10 feet, and didn't come at me again.
2 I know my self defense techniques work, because the morning after learning them, I get an unsuspecting coworker to attack me and I try them out, a tad harder and faster than in class...
1 I know my roundhouse kick works, because when the BIG DOG was charging at me snarling and growling and I nailed it with a picture perfect roundhouse kick, with just a little upward deflection, that German Shepherd FLEW about 10 feet, and didn't come at me again.
2 I know my self defense techniques work, because the morning after learning them, I get an unsuspecting coworker to attack me and I try them out, a tad harder and faster than in class...