Re: Fitness freakIt's up to everyone themselves, ideally in consultation with their doctor, to decide what the right exercise routine is or if it may be too much. It would depend on the state of their health and their personal fitness. And one should feel good after each training. You don't say how old you are and whether you did any sport before retiring. Nor do we know how intensive the weight training is. So, it's impossible for the reader to answer your final question.
Re: Fitness freakI have never been a Gym Bunny, my exercise is 50 lengths of the pool 5, sometimes 6 days a week. I also do a good walk with the dog every day, and a good bit of manual work around the garden or help out with some of the farm work when needed.