Losing Steam?

Lately John has been more and more difficult to motivate. No PT. Or very rarely. For the most part he sits on the sofa, watching movies. He is pretty much eating whatever he wants, and this worries me. I am by no means a shining example of physical fitness or proper nutrition for weight loss. But I am also not the one aiming for reentry to the military. I am afraid. I am afriad that he will e shipped to Iraq or Afghanistan, into a combat situation, and will not have the physical bearing to be able to keep up. He has gained a portion of the weight back that he had initially lost. I'm not quite sure how to get him motivated. Quite honestly, I should not have to. He should be doing this on his own.