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A great article about the outcome of proper martial arts training:

For 14-year-old Todd from east London, an incident outside his local train station proved just how much his martial arts training had changed him.

Eager to teach Todd a lesson, one of them lunged forward. In a flash Todd had the larger lad in a headlock. Seeing this, his mate backed off.

Todd knew he could have flattened them both, but he isn't that person anymore.

Source