It appears that the five foot or so sized Queen Victoria passed up the exercise but not the mashed potatoes. If you look at the Court Circular during her reign, you will notice that the Queen went out for a lot of carriage rides, but no walkies!
Queen Victoria's bloomers (50 inch waist) are up for auction.
http://www.telegraph.co.uk/news/newstopics/howaboutthat/2285942/Queen-Victoria%27s-bloomers-had-a-50-inch-waist.html