I know it's only exercise, but...

[ineluki]

As long as they aren't asserting that this sort of thing will save you in the event of an attack, I don't think it's a big deal. It's just another exercise fad.

I agree, as long as people aren't deceived into thinking they are doing self defence, od doing something really unhealthy, pretty much every activity is better than sitting at home, watching TV,