I retired at 44 but didn't realize it until 46. I recommend it wholeheartedly. Granted, I was used to it from ten years of seasonal work where "job" is this thing you do when there's work, and it pays enough that the other 2/3rds of the year you don't have to bother. Which sounds kind of like what you're dealing with, with the notable difference that nobody is expecting me to pretend to justify my salary. There's a flu going 'round. It's a dick. It's still in my lungs, although I never stopped walking. I definitely stopped running. Which is reflected in Strava. Which you were supposed to be my workout buddy on. So before you contemplate a personal trainer, maybe contemplate just getting out and taking in some fresh air. It's lovely out there lately. 
Oh man... Strava... forgot I had that installed! I still go out for two dog walks a day, minimum, and my knee is MUCHO MUCHO better-o, so i am going farther (somewhat) faster, when the dog isn't stopping every 9 feet to sniff something else, or try to eat yet another chicken bone someone discarded next to the road.