Have any of you tried formal swim lessons for your LO? DS1 will be 4 1/2 this summer and I'm thinking about it. He loves the water (lakes, pools) when we are in it together. But we did try a drop off gym and swim program for kids his age a year ago, and he was not into the swim lesson part at all. Learning to swim is extremely important to me for safety reasons, so I want him to learn soon. But I'm not sure at what age they are really ready for this.