Marathon swimmer Andy Donaldson talks about his freestyle technique and how he can hold 1:12/100m for 4 hours.

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00:00 Introduction
00:53 Head position
01:17 Breathing
02:49 Kick
03:43 Recovery
05:24 Exit
06:19 Rotation
07:01 Catch and Pull
08:23 Power
09:06 Increasing Speed
10:11 How Andy trains (suprising)