Answer:
skin is the largest organ
D, three to five times a week.
In adulthood, approximately 8% of the fat cells die yearly, they are then replace by new ones. The result of this is that adults develop a constant number of fat cells, this applies to those who gain more weight and those who lose masses of weight. What causes the body weight to rise and fall is the volume of fat cells.
I would imagine a reasonable goal to start with would be skate up and down your driveway.
I would go with all of the above
