There are four motions of your ankle: dorsiflexion, plantarflexion, inversion, and eversion. Several muscles attach near your ankle and help it move. Your ankle also has ligaments that attach one bone to another. These ligaments help prevent excessive motion around your ankle joint.
There are 39 calories in 1 teaspoon of Bacon Grease. Calorie breakdown: 100% fat, 0% carbs, 0% protein.
Which means you're eating about 3-4oz of raw bacon. That's 384-512 calories total (assuming you consume every drop of fat). My nutrition information also states that it's fried (or something like that, I don't have it in front of me)... which would imply that the 70 calories a slice would be after cooking.