I'm the same way- once I'm home I don't want to go workout!
BUT when I'm at work I want to go home- so I go on my lunch hour to the gym lol.
Days that I have off and I want to go to the gym, I plan stuff to do in the area so I'll go- my gym is by the grocery store I go to so I'll go to the gym then go grocery shopping.
It's just one of those things where you got to force your butt to go!