Susan Lawrence founded Stop the Rod after she found one advertised in Home School Digest.
Uh... yeah? Although spanking works fine for us.
When our kids were little, they never needed more than a swat or two on the upper part of the leg to 'break the pattern' and get their attention. Sir SuziQ swatted them on the fanny, but that usually just lifted them off the ground because it was so padded!
There's no need to hit a child repeatedly; they'll have your attention immediately, assuming you're not spanking for every little thing and it becomes useless because it's overused.