I find it hard to do the correct atemi.
It isn't at problem to stun a person, or to "unbalance a person. But how do you ensure that the response from the atemi is the one that you need for the technique your doing?
Most styls of Aikido have atemi in the flow of the technique, which means that they expect that the atemi contemplates the technique. But how are you sure that it does? Do you ever try it?
I have to agree on an earlier post stating that people that havn't had previous MA training (an at a certain level), is important. Not impossible, just imporatant for the concept of atemi. Because you have to know how uke will react to the Atemi. 2 cm (about an inch) is enough to get totaly different responses.
/yari