I really should be studying, but I quickly had to do the basic maths on this: Potential Energy is mass * gravity * height Lifting 15lbs about 0.5m in height [6.8kg * 9.81m/s^2 * 0.5m] requires about 33J, or about 1/126th of a kcal. Let's assume her arm to be about 5% of her bodyweight (12lbs of 242lbs), so she is lifting about 27lbs (12.5kg), which requires about 60J.  1 kcal is 4184J, therefore 70 repetitions equal 1 kcal. As the human body isn't perfectly efficient, let's assume it takes 50% more energy, so 35 repetitions consume about 1 kcal.  1g of fat stores 9 kcal of energy, so to burn 1g of fat, she has to do 315 repetitions. 1 million repetitions would equal a weight loss of about 3.174kg or 7lbs.  To "make all the fat go away", or lose about 133lbs, she only has to do 19 million repetitions.  Sounds like you're right on the money!