Drylands & Weights

I'm basically swimming MWF in the morning and occasionally on Sat morning. On those days inbetween I'd like to do some Drylands/Weights. Being that I'm just getting back into it I'm wondering what others are doing and if they could provide sample workouts here. For the last 15 years I've been a gym rat doing weights, cardio, etc. So I'm already fairly thick and muscular and just need to lean out. I have access to a gym and also have some basic stuff at home to make a circut (jump rope, medicine ball, small dumbbells, surgical tubings, mats). Like today, I WAS going to do weights but slept in before going to work. So this evening I figured I'd make up a circut and run through it a few times and take the dogs for a long walk. I need to always switch things up as I get bored quick and my body gets used to repetitious workouts in a few weeks. Running/Jogging is pretty much out as its too easy to tweak a bad back I've had since college, though very short stinks at a "jog" pace I can usually do. Thanks in advance! :)