Sorry Len, I'm with Big Tim on this one too.
At least you have two boys, they'll toughen each other up soon enough I'm sure.
My youngest, Erin was downhill skiing at 4 and waterskiing at 5.
My grandson, now 8 hasn't tried to waterski and freaked out so bad when I took him snow skiing (at 6) that I had to walk away and let his Grandma deal with him. I ended up putting him in the toddlers day school. His mom, my daughter, babies him so badly.