This is what I do AFTER I've tried rephrasing, giving positive encouragement and choices and they don't work. (I always try the nice way first). I had tried to get my stepdaughter to take her bath and no matter what I did she still didn't want to do it. She'd even run away and hide and a huge battle would follow.
I usually acknowledge her feelings "Time to take your bath" "No!" "I understand you don't want to, but we need to take your bath now." If that still resulted in a "no" then I would break down what I needed her to do.
"Stand up. Thank you. Walk to the bathroom. Thank you. Take your clothes off. Thank you. Get into the bath. Thank you." If she didn't want to follow one of the instructions, I'd repeat it (with no emotion) until it was followed. Sometimes I'd "help" her. For example, if she didn't want to stand up, I'd lift her under her armpits and stand her up. If she bent her legs I'd just keep repeating the command and what I was doing (with no emotion) until she stood up. Eventually she'd do it.
The bath was the biggest battle. Once I got her taking baths (because she knew she was going to have to do it, and also would not get a rise out of me by refusing) everything else fell into line! So if you pick the biggest battle and get them to do it, then you win them all :)
Again, this was after all the positive things didn't work.