That's easy to clarify :) Ok, I'll use a dressage test situation as my example. So, a rider has a lazy horse...to get the horse to WANT to go forward, the rider walks to a corner and stops. The longer it took the horse to get there, or the harder it was to get the horse to walk, the LONGER she lets him stay...this does NOT reward laziness, it creates incentive...the rider is driving home the point of "See, it's not so bad to go where I asked you to." Walk to the next corner and stop. Repeat that until the horse has more forward motion. The rider can then walk past corner 1 and stop at corner 2. Then repeat that at the trot and canter. The horse might even OFFER to trot or canter, in which case the rider would absolutely want to take it.
So once our rider has the horse going forward, she can start to have conversations with the horse such as "We can do a working trot from __ to __ and stop....we can do a circle at __ and free walk at __ then stop...etc. etc." If the horse remains forward and willing, then the rider can incorporate several maneauvers then stop. You just work your way up to doing an entire test (or jump course)....and if the horse starts feeling lazy, back off some on how much you ask of him at that time. Horses like these need shorter sessions but that are filled with tons of variety...if you keep asking and keep asking these horses for more and more and more they will shut down and just say NO lol.
Now if you are a jumper and your horse is lazy, use the same concepts, just with jumps....once the horse is forward on the flat, jump one jump then stop and chill. Once that's good, add another....then another....and so on until you can do an entire course.
With grazing spots, if you aren't in an arena, you don't stop at the same place each time....you just ride to A spot....a spot that has lots of great grass :) With using treats, again, the rider isn't BRIBING the horse to go....bribing does not work in the long run. It's just another option to use in an arena....have a barrel or something set up in certain spots in the arena with food on it and ride to that spot and let the horse find it. And really you could mix it up.....the horse gets a food reward overe here and a rest over there......does that clear things up?