I don't have an answer unfortunately, but I do have the same problem :-(
I enacted the Exercise NAP when the game first came out, when my sim was a teenager, removed the NAP and moved him out to a new neighbourhood, but ever since that NAP was enacted I literally can't get my sim to do anything - even though the NAP isn't active any more AND he lives in a new neighbourhood!
Ask him to cook? Nope. He'll get to putting the ingredients on/in the stove and then stop to do push ups and forget he was cooking.
Finally get him to sit down to eat? Nope. He'll have about 2 mouthfuls and then stop eating to get up and stretch.
Go for a swim? Nope. He'll get out of the pool to stretch.
Go to sleep. Nope. He'll get up super early to stretch.
Write a term paper? Nope. He'll stop and do push ups.
Make a drink...nope.
Go bowling...nope.
Basically, there's a theme!! It's just so hard to keep tracking his every movement to get him to complete any task when he keeps cancelling my actions.
It was the one and only NAP I enacted, and I learned to never do another one again! Sooo disappointed in how Eco Lifestyle works. I love the items, but the actual gameplay and the problems it causes is sooo disappointing :-(
