When hunting season nears for the 20th time in his career, a miserable assassin enrolls in his pregnant wife?s yoga and pilates class to rediscover a desire to kill.

I think this would be an interesting movie to watch. I quite like it.
However, I can't quite understand the first part of the logline, has he not been able to kill all along in the previous seasons that he has to rediscover the desire? Because that is how it sounds to me. Or is he desperate because for this season the desire is just not coming? Does the pregnancy play any part in this journey in a more antagonistic way? because if not maybe you should remove it. The objective goal though is very clear and works.

Good points above.

I'll add that his need may not be to re discover his love of killing, that is a highly subjective ambition. What if he suffers from some strange form of PTSD, as a result of his last job, and can't kill anymore - he's physically incapable of it. You can film him raising the gun, but not being able to pull the trigger, or holding the piano wire above a victims head, but not being able to put it on his or her throat.? You can't film him killing someone and not enjoying the process though.

His goal would then be to use the yoga and meditation classes to achieve inner peace so he can kill again.

For example:
After suffering PTSD from his last job, a professional assassin must undergo a series of yoga retreats in order to control his condition if he is ever to kill again.

I agree about the goal...

As for the inciting incident, it seems like joining the Yoga class is the inciting incident.

There was a movie called. 'Shall we dance'. (I believe the Japanese version was the better of the two) Where a proper and uptight business man joins a ballroom dancing class. Everything is going normal and then he joins the class and his perspective begins to change.