Sound is a little... off
The five diets had me rolling on the floor laughing and when my mum walked in and saw the 'personal sadist' she was more than a little freaked out. Good work.
As a whole, the movie is good, but I'm going to pick up some key areas where you can improve this.
There is no lip-sync, but you don't appear to need it, you just move the mouth as a whole, rather than part of it trying to form the sylables as they come out of the character's mouths. A bit of a cheat, but I'll let it ride.
The characters look a little like manakins which artists sometimes use to make skeletons for life drawing. Maybe you could 'flesh your characters out' a little bit, their movements are slightly jerky and disjointed.
The final point is the sound. It seems that you've used too much bass for the voices and it sounds a bit muffled when I listen to some of the characters, particularly the bodybuilder.