I love this thread.
Get a dog
My dog keeps me in shape because he needs to be walked daily, he is a collie and loves to run. He is my trainer - harder than Cathe.
If it wasn't for that dog, I'd never leave the house for a walk during the winter.
Seriously, for what it's worth - I have been video exercising since 2001.
I still weigh the same but it's harder to maintain. (being forever 40 is tough)
My abs are tighter and I'm stonger but my clothes still fit the same - although
I think my weight is shifting due to hormones.
But - for me, it doesn't matter what I do - I stay the same. I don't lift heavy enough to change my body shape and I don't eat clean enough to lose those extra 5 lbs - I can't maintain below 113 - I get too hungry.
So, for me, it's consistency that has kept me in shape, not one particular workout..
Caveat - the Firm seems to work very well for me as far as maintaining my weight and strength but I get bored with a strict Firm rotation so I end up doing other things and going back to the Firm.
I'll probably do a Firm rotation after I'm bored with Xtrain/LIS.