I made a big deal, if he went to the bathroom then I would act really happy and his dad would buy him a toy but of je didn't then we would get upset and he didn't want us to be upset either so I guess showing emotions helps to.
I'm potty training my 2 1/2 year old son right now and since it's warm were I am at I started leaving him in nothing but a tshirt and just kept telling him to get on the potty every 15 minutes even if he didn't have to and try, it's been a week now and he almost has it down. Now he goes to the bathroom without me having to tell him and only having 1 or 2 accidents in the day. Hope that helps you a little lol.