Learning to Yield

Cupid is progressing well, but still needs to work on yielding to pressure.  He bends his neck around if we are at a halt, but somehow it doesn't translate when we are moving.  So I'm still working on it with a leading rein, riding all sorts of circles and serpentines and crazy patterns.  We are doing a little leg yielding, and it is okay going towards the right but not as good to the left.  I've been riding with very light contact, but now the trainer wants to see me ask for more.  He doesn't do anything bad, but kind of resists it and braces his neck.  So I am slowly introducing side reins.  I tried them out very loose today.