I'm not a kid. In fact I'm in my 60's and I bought the game for myself after getting Wii Fit a and really enjoying the games that are included with that.
I LOVE this game (or series of small games) If you want a good workout and you're a kid at heart, you're going to love Outdoor Challenge. I've only played it by myself so far but I can tell you that it works every part of your body. I was dripping with sweat after 10 minutes. Some of the games you do standing, or I should say running in place and jumping over logs or jumping on a trampoline over water or jumping rope. There's a Mine Cart game where you're leaning to the side and lifting one foot while pumping both hands up and down to propel the cart at ever faster speeds. Or sitting on the mat and rowing with the "paddle" (wiimote) trying to get to the goal as fast as you can.
Like the Wii Fit games, it keeps track of your scores and the scores of others that play so you are constantly trying to beat your best scores and get top scores in the games.
This game is too much fun to waste on kids. Get it for yourself! It'll make you laugh out loud!