Rod... Its easy enough to say all that but when it comes down to doing it, it can become much more complicated.
.... I have seen horses who would not move forward and when you tap them with a whip, they rear or kick out.
...Lucara If you're scared to be around your horse at the trot.... (as I am!) then you know how scarey it can be to try and make an already frustrated horse do something through force.
I would wait until you can have someone more experienced help you work through the issue as apposed to trying it on your own again and letting the horse win 3,4,5 more times.