This is a funny question for me since we are a crazy sports family.  My small people have been playing organized sports – both soccer and T-Ball (now baseball and softball) since they were three years old.  And they absolutely love it.  I wasn’t athletic as a child, but my husband was, so I follow his lead.  I don’t know that there is an ‘ideal’ age to get kids involved, but I do think it is important to let your kids try different activities to see if they like them.  The flip side of that is that we don’t force them to do things they don’t love.