DD is nearly 2. She's recently started being really naughty doing things like throwing toys at me and especially hitting me. She does this a bit with DH too but so far no one else. She doesn't go to nursery.
Every time she does this DH and I tell her in a firm voice it's naughty, she's hurting us, and to be gentle and get her to say sorry. This never works though as she finds it funny
that she's hurting us and continues getting stronger with her hits. Often distraction will work but I feel like she's not realising/learning the behaviour is unacceptable and by distraction her we are giving her attention and showing her if she wants to be played with she just needs to hit us 
Yesterday we tried the naughty step technique but she just found it hillarious to have to go on the naughty step and then kept hitting me afterwards in shouting 'naughty' and running over the the naughty step in excitement 
Because she's only nearly 2 I'm not sure what techniques to try further and I feel I want to try to nip this in the bud before it gets out of hand. So, any advice at all as to how to deal with this, what I'm doing right or wrong would be really appreciated. I wonder if a reward chart would work?