Do you go to the gym when you're on a diet?

There are so many gyms these days that it's a bit hard to find one that suits me...

I get a lot of recommendations for personal training, but should I just go for a run outside?

Or I'm really debating whether to get some personal training at the gym before going to the gym.

I don't plan on doing intense workouts; I intend to combine them with a diet to reduce swelling and do light exercises.

Would it be good to get personal training?