The last time you skipped the elevator for the stairs? Try never. And your gym membership card is dustier than a post-swiffing Swiffer. (Not that you’d know what that looks like, lazybones.)

The problem isn’t that your get-up-and-go got up and went. You simply prefer not to sweat in the presence of people you don’t know very well.

Now you’ve no excuses. The folks behind Crunch introduce Push, the first-ever completely customized training sessions on DVD.

Go to www.push.tv, fill out a profile, and practically before you can find your sneakers, three personalized, cheese-free workouts (no overcaffeinated cheerleaders shouting platitudes at you) will appear at your doorstep every month. The exercises change as you do — so each time you drop a pound or gain some muscle, let Push know, and the next month’s routines will take your progress into account. Nice to know Push will figure out just when to step it up.

Which sure beats running up the steps.

Available online at push.tv.