Help to convince someone...

[Reijin]

A pool is not a good place to try to do this either. Go to a lake where the waves are fairly calm so that the slope is a little more constant (obviously you'll have to find out where this is in that lake). The problem with a pool is how you get to that point where it starts turning to deep, and then it quickly slides down to the deeper water. If you are walking forward, even slowly, momentum will begin carrying you forward even if you want to stop. Then if you aren't actually swimming over the water, you'll go under panicking b/c you are trying to go the other way.