Yeah, rest and see if it goes away. Just asking, are you saying you had to take 3 months off of exercise and then when you were cleared to go again you did your regular workout? You need to gradually work your way up to where you were before -- your body isn't the body you had yet, and if you're over a certain age, it might never be again. You have to take it slow or you're going to get hurt, which is what might have happened. If you rest some and it doesn't heal, I'd see my doc, because you did have a surgery and there's no safe amount of time that applies to everyone to get back to working out. I'm guessing it's just soreness because you did too much too quickly, but you do want to be sure.