I offered S$1 to Richard asking him to teach me free style this evening, when he was playing his water baloon.  He refused and asked for more.  I then offered S$2, but he asked for S$3 saying: "S$3.  That's it."  All right.  We made a deal.  Then, he swam back and forth a couple of times to give me a demo.  I followed his way and tried.  He stood by the pool and watched me very seriously.  After I stopped, he commented that I should not have bented my knees and should have tried to keep my legs straight during swimming.  I followed his instructions and tried again and again.  It worked!  I started to swim free style under his coach.  It was definitely a milestone for me.  Thank you Richard!  I paid him S$3 immediately after the lesson of course.