First, you focus on making yourself taller. Just to test it out. Since you can return to your normal size, you don't worry about it for now.
You think about being 8 feet tall, and slowly you begin to inch upward. You enjoy the slow growth, so you focus on keeping it slow and steady.
You feel yourself flowing with energy as your body slowly reaches higher and higher. At about 6'11" someone slams on your door which, you luckily, had locked.
"GET UP, ITS ALMOST NOON!" Your mom yells. This startles you, and your concentration is messed up by this event. The shock makes the growth extremely quick, and more than you assumed. At the time your mom slammed on the door, you shot up and your head hit the 11 foot ceiling, and you stopped growing.
"Oww" You say, rubbing your read.
"What was that Jake?" Your mom yells.
"Uh...I feel out of bed, I'll be down in a min!" You yell.
"Alright, I'm going to work, hurry and get out of bed." And with that, your mom leaves.
You shake your head and realize just how tall you actually are, and enjoy it. Now to get ripped.
You focus on yourself being huge, bigger than any body builder ever.
You feel the growth starting in your calves and forearms. They both swell to amazing sizes, and you look at your forearms, making you look like Popeye. Then your biceps slowly begin to swell, pushing your arms outward away from your chest. Veins start to appear that run down your arms.
Your shoulder muscles are next, and they expand and swell, along with your back muscles. Then it moves around to your pecs, and slowly they start to enlarge and swell to inhuman sizes.
As your thigh muscles begin to swell slowly, you feel your thighs rubbing against each other with their mass. You have to alter your stance to stop yourself from falling over. Your abs begin to swell next, each one individually. First, the top 2 swell, then the 2 under those, and so on.
As your thigh muscles reach their desired size, the muscles above your penis and your ass grow muscular. All of the energy that moved through your body now seems to be slowly moving toward your penis.
Then, you feel the energy slowly entering your penis and it begins to swell. The energy makes you erect, reaching about 15 inches, and it grows and grows.
You can actually hear your penis stretching and growing as it thickens and more veins begin to surround it.
Eventually the growth slows down and you feel the energy building up as this happens. Your penis stops growing at 2.5 feet long, erect, and about 8 inches across the top.
The energy builds and builds. You keep picturing your penis becoming bigger and the energy builds even more. Suddenly, your penis grows 2 feet longer in less than a second and hits the mirror in front of you, breaking it.
You smile. Now that is power. But you begin to think, if powers like this exist... then maybe superstition does too... Did you just run yourself into lots of bad luck?