I captured this video of a recent training session. An interesting training tool that Sergei brought to the pool. It is an Oxygen Meter that also measures heart rate. It really demonstrates how long after you start breathing it takes for the O2 to be replenish in your system.
[youtube=http://www.youtube.com/watch?v=uo7U9CyZV0w]
Great video guys. It is very well done by Sergei, that he can do a static that long with a pulse of 70 at the 4 min mark.