You know how you can hold most infants and they will put some pressure on their legs and stand up? Colin was never that kid. It's interesting to watch someone pick up Colin who is not a close friend or family member and realize that #1 he's not going to put his feet down to stand and #2, his body (torso) doesn't necessarily go rigid when you try to get him to stand either.
It seems as though something is "clicking" with him lately and he is making more attempts to stand, pull up and keep his feet down on the ground. It's still challenging, and he needs to be in the right place in order to do that. Colin's PT has been urging us to increase his standing time per session which we are trying to do, but he still gets that stubborness when he doesn't feel like doing it and he will literally lift his legs up off the ground. Wouldn't you expect that to be more challenging than just keeping your legs on the floor?
One game that Colin likes to play with me is "up!". I will take his hands while he is in a sitting position and say "1, 2, 3, Up!" and he will use his arms to pull up on me and stand. After a few seconds though, he likes to fall on me and get caught. This morning I got him to stand at his activity table while Mickey Mouse was on for a few minutes at a time.