I don't see any real health benefits of replacing sugar with agave but Mary Mcdougall did a version of the recipe where she used agave.
Makes 12 rectangleshttp://www.drmcdougall.com/misc/2009nl/jul/recipes.htm
1 (15 ounce) can black beans, drained and rinsed
1 1/2 cups agave nectar
2 tablespoons ground flax seeds
2 teaspoons pure vanilla extract
1/2 cup cocoa powder
1 teaspoon baking soda
1/2 teaspoon fine sea salt
3/4 cup whole wheat pastry flour
Preheat oven to 350F.
Line an 8x8” pan with parchment paper and allow about 1” of the paper to hang out on each side. This will allow you to lift the brownies out of the pan once they cool.
Place black beans and agave nectar in a food processor and puree until very smooth. Add the flax seeds, vanilla, cocoa powder, baking soda and salt and pulse to combine. Add the flour and pulse until just until barely combined, scraping the sides as needed. Do not over mix. Pour into prepared pan. Bake approximately 30 minutes or until center no longer jiggles when shaken gently and a toothpick inserted in the center comes out almost clean.
Allow to cool completely before slicing. Cut into 12 small rectangles.
I you guys like low-fat/calorie cookies/cakes you should browse the drmcdougall.com forum recipe section.
When someone says you don't train "functionally," you should just punch them in the face. Ask them how "functional" of a movement that was.