Working with an easy uke is at times very difficult. I understand this for the simple fact that when I first began to train, I was one of these. Yet, after some time I began to realize, people didn't want to pair with me for that reason. Soon afterwards, I began to strike harder and faster, not moving UNTIL I was moved. Shortly after this new plane of existence, lol, I was nicknamed "Uke #1" in my dojo. I love to be thrown, and put into locks. My Sensei says the best Aikidoist are first great ukes. So for those who are timid, just give them time, they might come around. And after some time, if not, just go hard on them and they have no choice but to go hard back. BUT BE SAFE!! lol. Later!