OK - braking problem is in the school, at the moment on hacks I don't do anything more than walking for those very reasons.
I'm a bit limited in terms of lunging, the reason she's been off work is because she did have inflammation around her navicular bone (the soft tissue) and while she's sound now with a huge amount of time being turned away, corrective shoeing etc lunging isn't a great idea. She's good as gold 90% of the time in hand, and we're not allowed to lose school at our yard.
Atm, she is turned out all night, I bring her in for 1pm (she thrives on routine) groom her, and pick out her feet etc, then she goes on our horse walker for 20 mins, 10 mins each way. I tack her up - I ride simples - she's not fresh, just the excitable sort.
In walk our breaks are sort of ok - it's as soon as we do anything faster or more exciting than walk they become a problem. I've had a few people ride her, and they've all had exactly the same problem so I don't think it can be just me iyswim.
today, I was attempting to do walk - halt - walk - trot - walk - halt etc at each letter, she got it, she knew what was being asked, started off excellently, however after she got the gist of it I think the third go that was it, she was trotting & it was taking me three or for letters round to bring her back to walk. she'd just decided she preferred trotting and that was that (not to mention a few strides of canter in each corner) jogging sideways and anything she could to avoid stopping.