For the persistent jumpers, pushing them off does not work. Any physical contact with the dog, even if you interpret it as removing the dog from doing something they aren't supposed to do, is seen as a positive for the dog. You touching them, bending down towards them and speaking to them (even in a stern voice) is the attention that they are looking for. So when the pup jumps up, just turn your back to them and walk away. No eye contact, no touching, no talking. Once they have 4 on the floor, praise as if they just saved Timmy from the well!