[Ogedei]

Honestly that is among the most ridiculous thing I have heard.

If you take a tai chi class you are no longer learning on your own.

Eventually you will naturally squat with perfect form, deadlift with perfect form, pitch a baseball, shoot a puck etc etc. All of these are complex physical movements, punching included, that although you can learn by yourself, you can certainly learn better, stronger, less injury prone techniques from Masters who have learned from Masters who have learned from Masters.

I strongly doubt you can simply throw and self analyze and learnt to thrown a punch as well as someone who trains under someone who already knows how to punch.

As DP said, all you will really do is learn bad technique, which will be harded to break than learning properly from scratch.

Og.