Yes, she dosent care. Spent 20 minutes walking back and forth in a 4 foot line, back and forth. Didnt get the concept. When I took her for training with her front clip harness/flat collar the trainer said she dosent understand leash pressure at all. She gave me a slip lead and made me choke her around and I didnt like that at all. The prongs dont choke her and she reacts to them most of the time. Shes very stubborn and isnt a soft dog, I honestly think I need to correct harder than I am since she seems like she dosent care when I give a slight correction.
Did the trainer make you walk back and forth? That seems wrong to me. I think you may need a new trainer, because between that and choking your dog it seems there is a breakdown somewhere.
You cannot correct a behavior until you teach a behavior and I have a tough dog, have had a few.
Dogs that forge ahead, I circle in on. Dogs that lag behind, I circle away from. Figure eights are awesome for getting dogs to pay attention so are quick direction changes BUT you cannot telegraph your intentions!
I like empty parking lots for training obedience because a) they tend to be boring and b) they have things like poles and lines that you can use as guides.
Put her in a properly fitted flat collar and walk. If she forges ahead turn around and walk the other way quickly and without warning. Map out a square and walk it. No communicating or coaxing just walk. When you're done turn around and walk it in the other direction. She doesn't need to understand leash pressure, there shouldn't be any. She needs to learn to watch what you are doing. Once she learns that you can use luring to put her in heel position.
And as @huntergreen
said let her run, and pee, first. It is unbelievably tough to focus with a full bladder! I used to play frisbee with Shadow for 15 minutes or so before even attempting to do any training, otherwise she was a disaster.