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It is often said that real martial skill in tai chi depends on an understanding of the 13 postures. But there is so much confusion about what the term "13 postures" even means, that most teachers are better off not talking about them. In fact, most don't deal with them in depth. This may be either because the teachers don't think they are important, or because they don't think the students will understand.

Chapters:
00:21 Why is it so confusing?
06:24 Common explanations
07:59 Mechanics of combat
09:23 Flavours of Mass and Velocity
10:01 Inertia, momentum, and kinetic energy
12:50 Conservation of momentum could be more dangerous
15:00 Squishiness vs Boingy-ness (Elastic modulus)
17:35 Tensile, good. Shear, bad.
19:00 Peng is a natural instinct
19:40 Softer is harder.
20:35 Hard power vs Soft power
22:15 Pressure: Ji and An
26:20 The 4 Directions (Peng, Lu, Ji, An)
27:46 Angular momentum (the 4 corners)
30:10 Splitting
31:03 Plucking
32:15 Breaking the needle
34:10 Sharpening the broken needle
35:55 The 8 trigrams in the hands
36:50 The arms are not legs
39:50 5 elements in the feet
40:37 Force
41:23 Space
43:59 Centre
44:06 Look right
45:14 Gaze left
47:57 All together now
48:55 13 posture in the tai chi routines
51:00 13 postures in self defence
53:00 The challenge of using real words and physics

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