IN: What happens next?

How to serve a tennis ball
Get in position.
Before you begin to serve the ball, you have to stand behind the baseline, on the side opposite the service box where you'll be serving. You should stand sideways, pointing your left foot to the opposite post of the net, with your right foot being parallel to the court.

OUT: For singles, stand close to the center mark. For doubles, stand farther toward one side, depending on what type of serve you plan to execute and the strategy you and your partner have planned.

IN: What happens next?

How to age aluminum
Rough up the surface with sandpaper.
If you want a truly distressed and aged look, but are working with shiny, new aluminum, you can sand it down. Use 80-grit sandpaper to rough up the surface of the metal.

OUT: Spray your aluminum with bleach. Wear a mask and protective gloves when working with bleach.

IN: What happens next?

How to make extra crispy roast potatoes
Preheat the oven.
Set the oven to 220c (425f/gas mark 7).
Parboil the potatoes.

OUT:
Place the potatoes into a saucepan of water. Cover with the pan lid and bring to a simmer.