My granddaughter was VERY hard to potty train until I saw a "Nanny" type TV show that showed the mom, dad or sitter doing a special dance with the child every time they went potty. I made up a very simple dance and told her I had a special dance we would do every time she used the pot. Well, this intrigued her more than candy or toy bribes ever had! Make sure it's something simple with a catchy tune that they can easily learn.
Mine went something like "We do the potty dance, we do the potty dance, we kick one foot up, then the other foot up, then we turn around, and WHOOO!" (and on Whooo, we jump up with our hands up in the air!) You do this with your little one while holding both of their hands (like in ring around the rosy). and I'll guarantee you, They'll feel SOOO special that they have their very OWN dance that they'll continue to want to use the potty again and again! (We made up a different dance for #2) The potty dance takes less than one minute of your time, but BOY-OH-BOY it sure does motivate them!
I have a son who just turned three. I am having a really hard time potty training him.