Wheel tension

for the stressing bit you don't need to ride it
just put it on the floor axle down and hold the wheel at 9am and 3pm ( clock face ) and push down
spin through 10 degrees and repeat until you have been all the way around the wheel
you'll hear pings and twangs as the spokes re seat themselves
feel a wheel that is already built and match the tension on that one i guess
couple of mm's play on each spoke ?

dicki clearly explained this better than me.

Sheldon is a must read too.