Shopping as a "workout"

I am doing better yet I am still leery of climbing the steps.  After a couple of tumbles this past week, I am still careful.  I did however, some exercise.  Pushing a heavy grocery cart for nearly two hours is good for the shoulders, back, and abs.  I even managed to burn a few calories in the process.  I hope the calories did not go to waste with all that I consumed today.  Tomorrow, I will rest.