Materials:
- roll of masking tape
- some small cars, trucks, trains, etc.
Seriously, all you have to do is tape some lines to the floor. The kids will pretty much figure out the rest. But here are some activities to encourage them.
Ask them to choose a line (curvy, straight, or zigzag), and walk one foot in front of the other forward and backward.
When they get to the cross line, ask them to turn "left" or "right."
Ask them if they can show you how fast they can run down each line.
If you have more than one, have them race.
If you have one, race with him/her.
Get out some toys to have them run across the lines.
Ask if they can jump from one line to the next.
Ask them to put one foot on each of two lines and try to walk that way.
Basically, if you need some free time to do the dishes or, you know, write in your blog, just let them figure out their own games with these lines.