BIG BOYS

Hi I just wanted to introduce myself. I am JA JA. JA JA is a term of endearment and basically means grandmother. I have 3 sons none of which have shown a serious interest in sports. This is partly due to them being raised by me a single parent, and I have never been very interested in sports. Now that my sons are BIG BOYS- my baby boy just turned 14 on May 16th and he is about 6'5" tall and weights over 300 lbs. So I need help! These BIG BOYS need to get more active. Get off the couch, off the computer and get outside and be active. Now what do I do first?