I really enjoyed Krabi and it's close enough to Koh Phi Phi or Koh Lanta if you want to throw in little trips. I'm unsure about gyms but there is a Tiger Temple with over 1,200 steps to the top if you are feeling leg day, its worth the view. There was a dog at the top somehow and I met someone from my home city up top as well.... small world.I don’t really care much for partying or needing to go to the beach daily. I just like chilling gymming and eatingso Bangkok or any major city I would be super content with. And I could make like a multi day trip to visit other cities. Just wondering if anyone had any recommendations.
I actually prefer cities cause it usually has good restaurants and convenience of having everything I need in one place.
Phuket isn't far off either but a little dirty. Pattaya seems to be popular but never got a chance to stop by. Bangkok might be the place for you if you are looking for top tier gym + restaurants.