My 5 y/o (middle son) is an extremely tense, serious child. I am trying to find ways to get him to relax and be more child-like. He has always been like this but lately it has bothered me more than usual. Ever since he was born he has been like a "cranky old man". The other day he fell asleep on his stomach with his legs folded up at the knee and when I went to lower them, they were really stiff and hard to move. He is very active and if it weren't for us homeschooling, we probably would've been told he has ADD or ADHD. He loves to be moving, he loves sports & activities but as he is not our only child (we also have 8 & 3 y/o boys), it gets hard to do these things on a regular schedule. He goes outside & runs around with our dog and we take walks and when the weather is nicer we go to the park & also play tennis, ride bikes, skateboard, scooters, etc; Does anyone else have similar issues? I am just wondering what to do, if anything. Thanks for any advice!