I've started attending my martial arts school's "core" class on Saturday mornings. It's the one day I can attend, it allows me to reconnect with the community there, and it's a great workout.
I have to be careful about kicking since my right knee no longer has an ACL. I can't torque on that leg, I have to kick in a controlled manner without too much force, and I can't balance on my right leg. I make adjustments.
I'm still going to the gym before work 4 or 5 days a week, doing cardio and weights. But the class on Saturday is a good booster for me, physically and psychically.