If you're interested there are a couple of folks that have posted videos of their active cornish cross free ranging with the best of them. You can look for Beekissed and aoxa. Seen pictures of them near the top of a 10' step ladder.
There are some things you can do to keep more active birds...
Did you free range the cornish cross? Some folks attribute the better taste to whether or not the birds are active and eating a varied (is natural too simple a word?) diet.